Forensic Medicine and Toxicology
Medical ethics may be defined as the moral principles, which guide the members of medical profession in course of their practice of medicine & their dealings with their patient, other members of the profession & with the state.
It is the laws of conventional courtesy observed between the members of medical profession.
Declaration of World Medical Association:
|1970||The declaration of Oslo||Therapeutic abortion|
|1973||The declaration of Munich||Racial, political discrimination etc. in medicine|
|1975||The declaration of Tokyo||Torture & other cruel & degrading treatment or punishment|
|1975||The declaration of Helsinki||Human experimentation & clinical trails|
|1981||The declaration of Lisbon||Rights of the patient|
|1983||The declaration of Venice||Terminal illness|
|1983||The declaration of Oslo||Therapeutic abortion|
|1984||The declaration of Sao Paulo||Pollution|
|1987||The declaration of Madrid||Professional autonomy & self regulation|
|1987||The declaration of Rancho Mirage||Medical education|
|1989||The declaration of Hong Kong||The abuse of the elderly|
|1995||The declaration of Lisbon||The rights of the patient|
|1996||The declaration of Helsinki||Biomedical research involving human subjects|
|1997||The declaration of Hamburg||Support for doctors refusing to participate in torture or other forms of cruel in human or degrading treatment|
|1998||The declaration of Ottawa||The right of the child to health care|
Geneva Declaration of 1948:
- I solemnly pledge myself to consecrate my life to the service of humanity
- I will give to my teachers the respect and gratitude which is their due
- I will practice my profession with conscience and dignity
- The health of my patient will be my first consideration
- I will respect the secrets which are confided in me even the patient has died
- I will maintain by all means in my power, the honor and noble traditions of the medical profession
- My colleagues will be my brothers and sisters
- I will not permit consideration of religion, nationality, race, party politics, or social standing to intervene between my duty and my patient
- I will maintain the utmost respect for human life from the time of conception & even under threat; I will not use my medical knowledge contrary to the laws of humanity
10. I make these promises solemnly, freely and upon my honor.
Codes of medical ethics:
- Duties of physician in general
- Duties of physician to the sick
- Duties of physician to each other
Bangladesh medical and dental council is a statutory body form under medical act 1973 by act on CCC of 1973, to look after the medical profession of the country so that public can identify who is qualified or who is not. The statutory body adopted an ethical code for registered medical practitioner of Bangladesh. It is governing body consisting of 54 members, some are elected & some are nominated. The members hold the office for 5 years. They elect one President & one Member Secretary
Functions of BMDC:
- Maintenance of a register of qualified medical practitioners
- Regulation of the standard of both undergraduate & postgraduate medical education & examination all over the country
- Recognize the medical & dental qualification both from home & abroad.
- Adopts code & ethics for the guidance of its member
- Have disciplinary control to issue warning notice for professional infamous conduct.
- Advise the government when necessary
- Empowered to enter into the negotiation with foreign authorities for setting up a scheme of reciprocity for the recognition of local medical qualifications
Punishment imposed by BMDC:
- Issuance of warning notice
- Erasure of name from register either for temporary period or permanently
The name of the doctor is removed from the medical register under the following circumstances:
- Entries which are made in error or as a result of fraud
- Penal erasure
- i. Issuing a false medical certificate
- ii. Criminal abortion
- iii. Dichotomy
- iv. Covering
- v. Violating the provision of drug
- vi. After the death of the doctor
Criteria of getting BMDC Registration:
- MBBS certificate from an institution recognized by BMDC
- A period of compulsory internship training for a period of minimum one year in an institution approved by BMDC
- One year internship training certificate
- Application form, code of medical ethics
- Nominal fees to BMDC
- Registration has top be renewed every 5 years
Difference between BMDC & BMA
|Abbreviation is Bangladesh medical and dental council||Abbreviation is Bangladesh medical association|
|Located at 86, Bijoynagar, Dhaka||Situated in BMA Bhaban(in front of National Press club)|
|Giving registration to the doctor||Giving no certificate|
|It is a statutory body||It is a voluntary organization of doctors|
|Provides the course & curriculum of medical education||Cannot provide course & curriculum|
Rights & Privileges of Registered Medical Practitioner:
Right to —
- Choose patient
- Add title, description etc to the name
- Practice medicine
- Dispense medicine
- Posses & supply dangerous drug to patient
- Recovery of fees
- Get appointed at public & local hospital
- Issue medical certificate
- Give evidence as an expert
- Remove eyes of deceased person
- To do justifiable abortion
When a doctor can discontinue treatment?
- When the patient wants to change doctor
- When patient does not follow his instructions about medicine
- When he is not paid
- When the doctor is convinced that patient feigning illness
- When practitioner himself became sick
- When another practitioner is also attending the patient
- When the patient persists in the use of intoxications
It is an implied term of contract between the doctor and his patient. The doctor is obliged to keep secret all that he comes to know concerning the patient in the course of his professional work. Its disclosure would be a failure of trust and confidence.
A doctor should not discuss the illness of his patient with others without the consent of patient. A doctor should not answer any enquiry by 3rd parties even by near relatives of the patient, either to the nature of illness or to any subsequent effect of such illness on the patient.
It is defined as a statement made by a doctor to the authorities concerned in the interests of the community or the public towards whom who he has a legal, social or moral duty, although such communication under normal conditions contravenes the general rule of professional secrecy.
Justifiable Privileged Communication:
- When doctor is called a witness in a court & judge asks him to make a statement
- When the doctor has a moral or social duty to do so
- To safe guard the doctors own interest
- When it becomes his duty of a doctor as a citizen to help in capture a culprit who has committed a serious come outweigh his obligation to his patient
Examples of Privileged Communication:
- Infectious disease:
If patient suffering from infectious disease is employed as cook, waiter or food handler with enteric infection, or teacher with TB or other disease or as nurse etc, he should be persuaded to leave the job until he becomes non infectious.
- Servants & employees:
An engine driver, bus driver or ships officer may be suffering from epilepsy, high blood pressure, alcoholism, drug addiction or color blindness. Doctor should persuade him to change his employment.
- Venereal disease:
If person is suffering from syphilis & about to marry, it is doctor’s duty to advice him not to marry until cured.
- Suspected crime:
If doctor learns of serious crime e.g. murder, assault, rape by treating victim or assailant, he is bound to give information to the police.
- Self interest:
Both in civil & criminal suits by patient against the doctor, evidence about patient’s condition may be given.
- Patients own interest:
The doctor may disclose patient’s condition to some other person so that he may be properly treated, e.g. to warn the parents or guardians of signs in the patient of melancholia, suicidal tendencies etc.
- Negligence suits
When physician is employed by opposite party to examine patient who has filed suit for negligence, information thus acquired is not privileged & the doctor may testify to such information.
- Courts of law:.
In a court of law, a doctor cannot be privileged concerning the facts about the illness of his patient, if it is relevant to the inquiry before the court. The doctor should protest to the court if he is asked to reveal any professional secret.
Professional negligence is defined as absence of reasonable care & skill or willful negligence of a medical practitioner in the treatment of his patient, which causes bodily injury, or death of patient.
It is a form of negligence in which a patient brings an action for damages in civil court against his medical attendant who owed him a duty of care if he had suffered injury in consequence of negligence or unskilled treatment.
Example of civil negligence:
- Failure to suggest consultation
- Failure to warn of side effects
- Negligent management of procedures
- Experimenting on patient without consent
- Not ordering x-ray examination
- Failure to provide substitute during his absent
- Giving overdose of medicine & poisonous substances carelessly
It occurs when the doctor shows gross lack of competence, gross in attention, gross negligence towards patient. These cases are dealt with in the criminal court
Example of criminal negligence:
- Most cases are associated with drunkenness or impaired efficiency due the use of drug by the doctor
- Amputation of wrong finger or operation on wrong limb or wrong patient
- Leaving instrument, tubes, sponges etc
- Gross mismanagement of the delivery of a woman
- Give wrong or infected blood
- Injecting basal anesthetics n a fetal dosage or in wrong tissue
Concurrent negligence by the patient & doctor resulting in delayed recovery or hare to the patient
Corporate Negligence: occur when
- Hospital provide defective equipments or drug
- Incompetent employees
- Fails to meet accepted standard of care
An employer is responsible not only for his own negligence but also for the negligence of his employees (subordinate).
- Employer –employee relationship must be present
- Conduct occur within the scope
- Must occur while on job
- Example-during operation the principle surgeon is not only responsible for his act but also the act of nurse, assistant
The manufactures of drug & medical equipments have legal duty to protect the public against risk of injury associated with their patients. Any deviation from this may result in injury or death of the patient
Doctrine Res-ipsa Loquitor:
The Latin phase meaning ‘the facts speak for themselves’. Generally, the burden of proving negligence lies with the plaintiff only exception is when facts are obvious the defendant is forced to provide an explanation
- Patient goes to OT for amputation of right Leg but comes out with left leg amputated.
- Failure to remove swab, instrument during operation
- Prescribing overdose of medicine
Conditions invoking res-ipsa loquitor:
- The nature of injury suggests that without negligence it cannot occur
- The plaintiff must not contribute to his own injury
- The defendant must be in exclusive control of the instrument
Professional Infamous Conduct:
It is as conduct on the part of a medical practitioner during the practice of his profession, which would be reasonably regarded as dishonorable or disgraceful by his professional brethren of good repute and competency.
Examples of professional infamous conduct:
- Abortion (performing criminal abortion)
- Addiction of drugs
- Association for mare countenance of practice
- Advertisement to promote practice
- Avoiding consultation
- Attending a patient who is under care of another practitioner
- Contravention of drug law
- Conviction for offences of moral turpitude
- Commercialization of secret remedy
- Disregard of personal responsibilities to patients.
- Issuing false certificate
- Running open shop
- Refusing to give professional service on religious ground
- Talking disparately about other colleague
- Prescribing in a secrete formulae
Receiving or giving commission or other benefits to a professional colleagues, or manufacturer or trader in drugs or appliances or a chemist, dentist etc.
Medico legal importance:
- It is unethical
- Erasure of name from registration
Sharing of fee generally received by a combined operation case among surgeon, his assistants, nurses & bearers
Medico legal importance:
- It is ethical
- No question of erasure of name from registration
This means assisting someone who has no medical qualification to attend, treat or perform an operation on some person in cases requiring professional discretion & skill.
Novus Actus Interveniens:
The principle of novus actus interveniens starts that –a person responsible not only for his actions for the legal consequences of that action. According to this theory- a doctor is not responsible for the damage caused by any intervening activity done by a third person during the treatment.
Euthanasia means producing painless death of a person suffering from hopelessly incurable with painful disease. It is also known as mercy killing. Practiced in Netherlands, Columbia, Oregon state of USA
It is not possible in Bangladesh- as there is no prevailing law, social &religious factor, and ethical background of a doctor.
- Lethal doses of opium or other narcotic drugs is administer OR
- Withdrawal of all the life saving apparatus
- Active or positive
- Passive or negative
Consent means free, voluntary agreement, compliance or permission, which is legally valid. It must be given after understanding what it is given for, and of risks involved.
When the conduct of a person is very much indicative that he is agreeable to some act or he desires the act to be done then it is implied that he has given consent for the act, even though he has not expressed his consent in words or letters.
Criteria of implied consent:
- Not written
- Proved by the demeanor of the patient
- Limited unto inspection, palpation, percussion & auscultation
- Legally effective or valid where proof is difficult.
- When a patient goes to a hospital or chamber to see a doctor
- When patient holds out his hand for an injection when doctors asks
Expressed consent is one, which is specifically stated in verbal or written manner –“I with my full consent want to undergo medical examination along with my private part, the results of which may go envious or against me”.
Consent becomes invalid when in the following cases:-
- The act is unlawful –criminal abortion
- Consent of minor less than 12 years
- consent of insane (mentally ill), intoxicated or if consent is taken under threat (section 90 bpc)
- Not informed consent
- Obtained by misinterpretation
- Consent of a female for sexual intercourse is invalid:-
- If the age of the girl is below 16 yrs
- Mentally retarded person
- Intoxicated person
- Obtained by fraud, force or fear of death
- Obtained after the act
- Necessary in an emergency treatment operation if no guardian is available or the patient is unable to give consent. (Section 92 BPC)
Consent related to age:
- If age is less than 12 years, consent should be taken from guardians
- If age is less than 16 years a girl cannot give consent for sexual intercourse
- If age is more than 12 years but less than 18 years, consent should be taken from both guardian and patient
- If age is more than 18 years, one can give valid consent for suffering any harm, which is done for benefit for him. (Sec-87 BPC)
Consent must be taken:
- Medico legal examination of the victim
- Before surgical operation
- Before giving anesthesia
- Before blood transfusion
- Before contraceptive sterilization
- Before radiotherapy
- Before any risky investigation for disclosing professional secrecy
- Clinical autopsy
- Human experimentation of drug
Consent is not needed:
- Medico legal autopsy
- Examination of the accused
- Compulsory vaccination
- Before any emergency operation
- Prevailed communication
- Manor-children less than 12 years
- Mentally ill person
- Comatose patient
- Loco Parentis
In emergency involving children, when their parents / guardians are not available, consent is taken from the person in charge. E.g. School teacher can give consent for treating a child who becomes sick during picnic away from home. Headmaster of a residential school
There are 2 distinct aspect of law medicine relationship
- Forensic medicine
- Medical jurisprudence
It is a branch of medical science, which deals with the application of knowledge of all branches of medical science, whenever and wherever required for the purpose of law in both civil and criminal cases.
It medical jurisprudence can be defined as a science, which deals with the application of knowledge of law for the guidance of medical profession.
Aim – To find out the truth, help in justice and save the doctor.
Branches of forensic medicine:
- Forensic toxicology-deals with legal aspect of harmful effect of poisons
- Forensic pathology-deals with the dead body and fatal trauma to determine the cause and manner of death in case of sudden, suspicious, unexplained death
- Forensic dactylography-deals with fingerprint for the establishment of identity of individual
- Forensic radiology-deals with x-ray examination for determination age in various criminal cases, detection of cases, detection of fetus, diagnosis of head injury, etc.
- Forensic odontology-deals with teeth
- Forensic serology-deals of examination of blood and seminal staining
- Forensic thanatology-deals with medical and legal aspect of death
- Forensic psychiatry-deals with application of psychiatry for evolution in legal purpose
- Forensic ballistic-deals with the investigation of fire arms, ammunitions
- Forensic criminology-deals with crimes and criminals
- Forensic obstetrics-deals with normal and abnormal delivery
- Forensic osteology-deals with bones
The Legal System:
- Criminal law
It deals with offences, which are considered to be against the public interest, such as offences against the person, property, public safety, security of the state etc
- Civil law
It deals with disputes between 2 individual or parties.
Courts of Bangladesh:
It consists of –
- Appellate division
- High court division
- Subordinate judiciary / district court
It has jurisdiction to hear and determine, appeal from judgments, decrees, order or sentence of high court division. It has rule making power for regulating the practice and procedure of each division and any court subordinate to it.
High court Division:
Though a division of Supreme Court, it is an independent court with its powers, functions and jurisdiction according to constitution.
Divided into three broad division—
- Civil court
- Criminal court
- Tribunal court
The civil court system is more popularly known as subordinate judiciary. It is created under civil court act, 1887. It consists of
- District judge court
- Additional district judge court
- Sub-judge court
- Assistant judge court
- District session court
- Additional session court
- Assistant session court
- Courts of magistrate
- Specially empowered magistrate (1st class magistrate)
- 1st class magistrate
- 2nd class magistrate
- 3rd class magistrate
|1st class magistrate:||Imprisonment not > 5 yearsSolitary confinement||Fine not > 10,000 taka|
|2nd class magistrate:||Imprisonment for 3 years||Fine not >5,000 taka|
|3rd class magistrate:||Imprisonment for 2 years||Fine less or equal to 2000 taka|
According to section 53 of BPC punishments are:
- Death sentence
- Imprisonment for life
- Forfeiture of property
An inquest is an inquiry or investigation into the cause of death. It is conducted in case of suicide, murder, killing by an animal or machinery, accidents, suspicious death and death due to anesthesia or operation.
Types of inquest:
- The police inquest:
This is the preliminary inquiry or investigation into the cause of all kinds of unnatural deaths by a police officer not below the rank of sub-inspector.
- The magistrate’s inquest:
This is preliminary inquiry or investigation conducted by a district magistrate, thana magistrate, magistrate of first class or any empowered magistrate to ascertain certain matters of fact
- Coroner’s inquest:
This is an inquiry conducted by coroner into the cause of any unnatural death within his territorial limits. In Bangladesh, it is invalid, in India this system is in force only in Mumbai.
Summons / Subpoena:
Summon is a document compelling the attendance in a court of law under penalty, on a particular day, time and place, for the purpose of giving evide
If the witness fails to attend the court:
- In a civil case, he will be liable to pay damages
- In criminal cases, fine or imprisonment
It is the fee offered or paid to a witness in civil cases at the time of serving the summons, to meet the expenses for attending the court.
Evidence may be defined all legal means which help to prove or disprove any matter in question in the court of law.
- Documentary evidences
- Documentary evidence includes
- All the statements, which the court permits/requires to be made before it by witness, in relation to matter of fact under inquiry.
- Medical certificate includes ill health, insanity, age, death etc.
Medical certificate accepted in the court only when issued by registered medical practitioner.
Medico legal Reports:
It is a report prepared by doctor usually in criminal cases on requisition of law enforcement authorities. It consists of facts observed on examination & the opinion drawn from the facts. It is not accepted as evidence unless testified by doctor under oath. It is open for scrutiny of defense lawyers. Careless statement, superlative, exaggerated terms must be avoided.
It is a written / oral statement of a person who is dying as a result of some unlawful act relating to the material factors of cause of his death on bearing on the circumstances.
Is a statement of a person at oath, recorded by magistrate in presence of accused or his lawyer, who is allowed to cross-examine the witness.
Difference between dying declaration and dying deposition:
Recorded by doctor
Recorded by magistrate
No oath is necessary
Oath taking must
Presence of accused or his lawyer is not necessary
Inferior to dying deposition
Superior to dying declaration
It includes all statements, which the court permits / requires to be made before it by witness in relation to matters of fact under inquiry.
- Direct evidence
- Indirect evidence
- Hearsay evidence
It is a person who gives evidence in the court of law, which helps to prove and disprove any matter in question.
It is a person who gives the evidence about the facts observed or perceived by him.
E.g. – In case of traffic accident, the person who witnessed the accident becomes the common witness.
It is a person who has been trained or skilled in the technical or scientific subject and capable of drawing opinions and conclusion from the facts observed by him or noticed by others.
E.g. Doctor, firearm experts, finger print experts, hand writing experts etc.
Hostile witness is one who is supposed to have some interests or motive for concealing part of the truth or for giving completely false evidence.
Conduct of a doctor in a witness box:
In the court of law a doctor or a medical witness would be –
- Well prepared and take all records or relevant documents
- Well dressed and modest
- Stand up straight, relaxed or calm.
- Be confident , but not over confident or arrogant
- Use simple language, avoid superlative term
- Speak slowly, distinctly and audibly
It is the determination of the individuality of a person based on certain physical characteristics which is unique to that individual.
It is necessary in case of:
- Living persons
- Recently dead persons
- Decomposed bodies
- Mutilated bodies
- Criminal cases like murder, assault, rape.
- Civil cases like inheritance, passport, insurance claims.
- Stature and general development
- External peculiarities such as moles, birthmarks, malformations, scars, tattoos, wounds, occupation marks
- Anthropometric measurements
- Fingerprints and footprints
- Dress, ornaments and other belongings in clothing, pockets or purse articles like diary, passport and letter.
Some criteria are used for identification of living person along with others.
- Speech and voice
- Gait, tricks of manner and habit
- Memory and education
It is also known as the body of offence or the essence of crime. It means the facts of criminal offence, which establish that unlawful act in that place. The main part of corpus delicti is-
- the establishment of identity of the dead body
- infliction of violence
- in a particular way
- at a particular time and place
- by the person or persons charged with the crime
Sydney Shark Case:
In 08-April-1935, James Smith disappeared. After 14 days of his disappearance a shark was caught alive from aquarium where it vomited a human arm. Medical examination revealed that arm was severed from a dead body by sharp weapon. That arm was identified as Smith’s by a tattoo mark showing two men boxing.
Age of an individual can be determined from:
- Ossification of bone
- Secondary sexual characters
- General development in case of children
Secondary sexual characteristics:
- 14 yrs old – Pubic hair grows testis and penis enlarges
- 15 yrs old – Axillary hair grows
- 16 yrs old – External genitalia have an adult appearance
- 16-18 yrs – Facial hair begins to appear and voice becomes hoarse.
- 13-14 yrs – Pubic hair grows, labia develops and menstruation begins
- 14-15 yrs – Axillary hair grows
- 12-20 yrs – Breast development
There are two sets of teeth:
- Temporary/Deciduous/Milk teeth – 20 in number
- Permanent teeth – 32 in number
|Features||Temporary teeth||Permanent teeth|
|Size and weight||Small in size and light in weight||Larger and heavier|
|Colour||China white||Ivory white|
|Incisors||Vertical||Slightly projected forward|
|Neck||More constricted||Less constricted|
|Ridge||Present in between neck and body||No ridge|
|Roots of molar||Smaller and more divergent||Larger and less divergent|
|Replacement||By permanent teeth||None|
Criminal responsibilityMedico-legal importance of Age
- Competency as a witness
- Judicial punishment
- Attainment of majority
- Criminal abortion
- Impotence & sterility
Race may be defined as a biophysical concept denoting species or subspecies of human being usually united by a common heritage.
|Skull||Rounded, medium headed||Square, short headed||Narrow & elongated, long headed|
|Limbs in proportion to body||Normal||Smaller||Longer|
|Eye||Blue or grey||Black||Black|
|Teeth||Poorly spaced||Evenly spaced||Less parallel to each other|
|Hair||Straight or wavy hair coloured brown or reddish.||Dark, flat and course.||Black and woolly arranged in tight spirals.|
Sex is one of the most important identification points of an individual. Sex can be determined from:
- Physical morphology, especially secondary sexual characteristics
- Microscopic study of sex chromatins in cells
- Gonadal biopsy
- Hormonal study
Traits from skeleton:
The degree of accuracy in sexing adult skeletal remains is:
Entire skeleton – 100%
Pelvis alone – 95%
Skull alone – 90%
Pelvis + skull – 98%
Long bones – 80%
|General size||Larger, more massive||Smaller and more slender|
|Long bones||Ridges, depressions and processes more prominent||Less prominent|
|Shaft||Rougher||Smoother, thinner and wider marrow cavity|
PELVIS & HIP BONE:
|Shape of true pelvis||Conical||Cylindrical|
|Sub pubic angle||50-60||80-90|
|Obturator foramen||Large, oval||Small, triangular|
|Pre-auricular sulcus||Infrequent||Frequently deep|
|Sacral curvature||Uniformly curved anteriorly||Abruptly curved at last 2 segments|
|Sacral promontory||More projected anteriorly||Less projected|
- Identification of a living or dead person
- Skeleton or isolated bones
- Concealed sex
- Heir ship
Intersexes means intermingling of features of both sexes in varying degrees in one individual stating conditions in which male and female characters such as gonads, physical form and sexual behaviours co-exist in various proportions. It results from some defect in the embryonic development.
- Gonadal agenesis
- Gonadal dysgenesis
– Turner syndrome
– Klinefelter’s syndrome
- True and Pseudo hermaphroditism
Medico-legal importance of intersex:
- Admission to a school
- Medical negligence cases
- Inheritance or succession of property cases
- Nullity of marriage
- Very rarely with rape and other sexual offences
Tattoo marks are designs elicited by multiple small puncture wounds made through the skin with needle or similar presenting tools dipped in a dye.
Most common sites where tattoos are present: Arm, Forearm, Chest
Medico-legal importance of tattoo
- The identity of a person can be determined.
- Profession/occupation maybe determined.
- Social status also maybe determined.
Trichology is the subject that deals with the study of hair.
Parts: Hair consists of 2 parts
Layers: Have 3 well defined layers
Information can be derived from hair:
- Human or animal
- From what part of body derived
- Accused hair /victim hair
- Cause of injury
Medico-legal importance of hair:
- Identification of the person involved in crime investigation
- Nature of weapon can be identified from the injury to the hair
- Age of person maybe determined from the growth of hair
- Sex maybe determined
- It helps in differentiating scalds from burns
- Poison can be detected in hair in case of arsenic poisoning
- Time of death can be determined
- Henry-Galton system
Fingerprints are the impressions of patters formed by the papillary or epidermal ridges of the fingertips. One’s fingerprint is unique to that individual and it has been speculated that there is one chance in 64 billions of 2 persons having identical fingerprints. Further study of fingerprint is known as poroscopy.
1. Loops – 67%
2. Whorls – 25%
3. Arches – 6-7%
4. Composite – 1-2%
Central pocket loops
Lateral Pocket loops
- Impressions left at the site of crime establish the identity of criminals
- Identification of suicides, deserters, persons suffering from loss of memory
- Identification in case of accidental exchanged of Newborn infants
- Prevention of impersonation
- To maintain identity of records
- Cheques, bank notes and other legal documents can bear a fingerprint
It is the technique applied to determine whether the skull is of the person in photograph.
Points that are compared are-
- Eyes within orbital plate
- Nasal spine
- Lower border of nose
- Zygomas below eyes
Other methods of identification:
- Palate print
- Lip prints
- Nose prints
- Congenital deformities
- Birth marks
- Occupation marks
- Pocket contents
Irreversible or permanent cessations of the three interlinked vital functions of the body are called death. Vital functions are-
- Circulatory system
- Respiratory system
- Nervous system
Together they are called – Tripod of life
Types of Death:
- Somatic Death:
Three functions are lost and life is still present in the component of body. Tissue is still responding to chemical and electrical stimuli. In short, somatic death is complete and irreversible stoppage of the vital functions.
- Molecular Death:
This is the death where life is not present in the component of the body. It means cessation of respiration and metabolism of body tissue, which is soon followed by autolysis and decay.
Medico legal Importance of Somatic Death:
- Issue death certificate
- Withdraw artificial maintenance
- Remove the organ for transplantation
- Dispose the body for disposal
Means the patients is died, whether or not the function of some organs such as a heart beat is maintained by artificial means, and all the functions of the brain must have permanently and irreversibly ceased.
Types of Brain Death:
- Cortical or cerebral brain death:
This produces a vegetative state in which respiration continues, but there is total loss of power of perception by the sense. This state of deep coma can be produced by cerebral hypoxia, toxic conditions or widespread brain injury.
- Brain stem death:
Where the cerebrum may be intact, through it has been cut off functionally by the stem lesion. This can be produced by raised intracranial pressure, cerebral edema, intracranial hemorrhage etc.
Brain stem death consist of –
- Deep unconsciousness with no response to external stimuli or internal need
- No movements, no spontaneous breathing
- Cessation of spontaneous cardiac rhythm without assistance
- No reflex
- Bilateral dilatation and fixation of pupils
- Flat iso-electric EEG
Cause of Death:
- Immediate Cause: The pathological process which lead to death The diseases or injury responsible starting the sequence of events, which are brief or prolonged that lead to death
- Basic Cause: Pathological process responsible for death at the time of terminal event or prior to or leading to the event
- Contributory Cause
Manner of Death:
Manner of death is the way in which cause of death was produce. The manner of death can be
- Natural: If the death occurs exclusively from disease
- Unnatural or violent: If the death occur exclusively by injury or is hastened due to injury in a person suffering from natural disease
Agonal Period: It is a time between a lethal occurrence and death.
Mode of Death:
According to Bichat, there are 3 modes of death, depending on whether death beginning one or other of the 3 system, irrespective of what the remote cause of death. These modes are-
- COMA- Failure of the nervous system
- SYNCOPE- Failure of the circulatory system
- ASPHYXIA- Failure of the respiratory system
It is a state of unarguable unconsciousness determine by the absence of psychologically understandable response to external stimuli or inner need.
- Compression of the brain
- Metabolic disorder and infection etc
Autopsy: Injuries or disease of the brain may be present. The lungs, brain & the meanings are congested, splanchnic pooling of the blood occurs
Syncope is silent stoppage of action of heart, which may prove fatal.
- Anemia due to sudden and excessive hemorrhage
- Vagal inhibition
- Exhausting disease
Autopsy: The heart is contracted and the chambers are empty when death has occurred from anemia, but chambers contain blood when death occurs due to asthenia
Asphyxia is a condition caused by interference with respiration or due to lack of oxygen is respired air, due to which the organs & tissues are deprived of oxygen, causing unconsciousness or death.
Type and cause:
- Mechanical: In this the air passage are block mechanically.
- Pathological: Infective condition & new growth of the lungs or in the respiratory tract
- Toxic condition
- Postural asphyxia
Symptoms of asphyxia:
- Stage of dyspnoea: increased carbon dioxide in the blood causing respiratory stimulation
- Stage of convulsion: carbon dioxide level further increased
- Stage of respiratory exhaustion: the respiratory centre is depressed.
Asphyxia is not a pathological entity and can not be clearly recognized from morbid anatomical findings along the triad of:
- Facial, palpebral, bulbar, sub pleural & subepicardial petechae
- Visceral congestion
All are due to raised venous pressure.
- Post-mortem lividity is marked
- Face is cyanosed
- Tongue is protruded
- Frothy & bloody mucus escapes from the mouth & nostrils
- Pupils dilated
- Tardieus spot
- The blood is dark & fluid
- The right side of the heart is full whereas the left side is empty
- The larynx & trachea are congested.
- Lungs congested & edematous
- Tardieus spot under the mucus membrane of organ
CHANGES AFTER DEATH:
- Immediate Changes (somatic death)
- Insensibility & loss of voluntary power
- Cessation of respiration
- Cessation of circulation
- Insensibility & loss of voluntary power
- Early changes (cellular death)
- Changes in the skin
- Changes in the eye
- Primary flaccidity of muscles
- Cooling of the body
- Post-mortem lividity
- Rigor mortis
Post mortem Caloricity:
The post mortem rise of temperature in certain cases is known as post mortem caloricity.
Due to – septicemia condition, Cholera, Heat stroke
It is also called
- Post mortem staining
- Subcutaneous hypostasis
- Livor mortis
- Cadaveric lividity
Medicolegal importance of PM Hypostasis:
- It is a reliable sign of death
- Helps in estimation of the time since death
- It indicates the posture of the body at the time of death and any movement after death
- It may indicate cause of death from its color
- In asphyxial death: Bluish, violet, purple
- In CO poisoning: cherry red
- In burn: bright red
- In phosphorus poisoning: dark brown
- Exposure to cold water: pink red
- In hemorrhage, anemia, wasting disease: very slight staining due to reduced amount of blood pigment
Rigor mortis is the state of stiffening of muscle with slight shortening of muscle fiber. It is also known as death stiffening, cadaveric rigidity. Individual cell death occurs in this stage.
It begins 1-2 hrs after death and takes further 1-2 hrs to develop. It may also begin in 3-6 hrs. Usually it lasts for 24-48 hrs in winter and 18-36 hrs in summer.
Condition altering the onset & duration:
- Nature of death
- Muscular state
- Atmospheric condition
Conditions Simulating Rigor Mortis:
- Heat stiffening: When body is exposing to temperature 65° C, it is seen in death from burning, high voltage electric shock and from falling into hot liquid
- Cold stiffening: When body is exposing to freezing temperature
Medicolegal Importance of Rigor Mortis:
- It is the sign of death.
- It extent help in estimating time of death, which is not reliable
- It indicates the position of the body at the time of death.
Cadaveric spasm: It occurs specially in cases of sudden death, excitement, fear, severe pain, exhaustion, cerebral hemorrhage, injury to nervous system, firearm wound of the head, conversant, poison etc.
LATE CHANGES OF DEATH:
- Putrefaction (decomposing)
- Adipocere formation
It is the process by which the complex nitrogenous substances in the body are converted into simpler one by the action of photolytic enzymes of the tissue and living saprophytic microorganisms. It is the surest sign of death.
Causes of putrefaction:
- Living saprophytic micro-organisms
Organisms involved in putrefaction:
- Clostridium welchii
They are mostly anaerobic and live in the intestine.
Characteristics features of putrefaction :
- Color change
- Development of foul smelling gasses
- Liquefaction of tissue
Medico Legal Importance of Putrefaction:
- It is the surest sign of death
- The different stage of putrefaction indicates the time since death
- Advance putrefaction obliterates the identity of deceased and the cause of deceased
It is the modification of putrefaction in which the body fat is converted into a brown waxy like substance occurs in bodies submerged under the water or buried in a moist grave or water lodged soil
- Sweetish smell
- Ammonia like odor
- Olfactory adaptation occurs within two minutes
Medico legal Importance:
- The features of adipocere in face are well preserved that helps to establish the identity
- The cause of death can be determined because injuries are recognized
- The time since death can be estimated
It is the drying of the body tissue due to rapid dehydration of the body in a dry or hot climate preserving the natural appearance of the body
Factors necessary for Mummification:
- Absence of moisture in the air
- Continuous action of the dry and warm air
- Characteristics of Mummification
- Loss of weight
Medico legal Importance of Mummification:
- The features in face are well preserved that helps to establish the identity
- The cause of death can be determined because injuries are recognized
- The time since death can be estimated
- Estimation of Time of Death
- Time since death condition of the body
Death is said to be sudden or unexpected when a person not known to have been suffering from any dangerous disease , injury or poisoning is found dead or dies within 24 hrs after the onset of terminal illness.
- Disease of CVS
- Disease of Respiratory system
- Disease of CNS, GIT, genitourinary system
- Miscellaneous –Addison’s disease, DM etc
It is the digging out of an already buried body from the grave.
Autopsies are performed on exhumed bodies:
- In criminal cases, such as homicide, suspected homicide distinguished as suicide, suspicious poisoning, and criminal negligence.
- In civil cases, such as accidental death claim, insurance, workmen’s compensation claim, liability for professional negligence, survivorship & inheritance claims or disputed identify.
It may be defined as disruption or dissolution of the anatomical continuity of the tissue out of the body irrespective of breach of continuity of skin because of blunt trauma.
It is defined as any harm what so ever illegally cause to any person in body, mind, reputation or property.
MECHANICAL INJURIES are injuries produced by physical violence.
TYPES: a) Due to blunt force>1. Abrasion
4. Fracture & Dislocation
b) Due to sharp force>1. Incised wound
2. Chop wound
3. Penetrating wound
c) Firearms & bomb blast injuries
It is a destruction of the skin, which usually involves the superficial layers of the epidermis only.
- Bleeds slightly
- Heals rapidly
- Leaves no scar
- Have 2 dimensions – length, breadth, no depth
- Scratches -very superficial. I.e. by nails, pins etc.
- Grazes -common in RTA.
- Pressure -I.e. strangulation mark, bite mark.
- Impact -caused by impact to any rough surface.
Age of abrasion:
- Fresh : bright red
- 12 to 24 hours : lymph and blood dries up leaving a bright scab
- 2 to 3 days : reddish brown scab
- 4 to 7 days : epithelium grows and covers defects under the scab
- After 7 days : scab dries
Medico legal importance:
- Site of impacts
- Identification of object
- Time of injury
- Cause of injury
- An abrasion on the neck may indicate throttling, hanging or strangulation.
- An abrasion around the nose and mouth indicate smothering.
- If found on the breast genitals inside of the thigh and around the anus indicate sexual assault.
It is defined as subcutaneous rupture of blood vessels and effusion of blood into the tissue, caused by blunt trauma.
Factors modify the appearance of bruise:
- Site of injury – bruising occurs more easily in areas overlying bone where the tissue is lax
- Vascularity – greater the vascularity, greater the bruising
- Age – children and old people bruise more easily
- Sex – in obese women bruise is most easily
- Natural disease – diseased vessels
- Shifting – bruise does not always appear at the site of impact
Age of the bruise:
- Initially : reddish
- Few hours to 3 days : blue (due to haemosiderin)
- 4 to 6 days : become greenish (due to haematoidin)
- 7 to 12 days : yellowish (due to bilirubin)
- 2 weeks : normal
Medico legal importance:
- Patterned bruises may connect the victim and the object or weapon
- Age of the injury can be determined by color change
- Degree of violence may be determined from the size
- Character and manner of injury may be known
DIFFERENCES BETWEEN HYPOSTASIS & BRUISE:
|Cause||Distension of vessel with blood in the dermis||Effusion of blood due to rupture of blood vessels|
|Site||Dependent parts of the body||Anywhere of the body|
|Appearance||No elevation||Often swollen|
|Epidermis||Not abraded||May be abraded|
|Margins||Clearly defined||Merge with surrounding area|
|Color||Uniform bluish purple||Old bruises are of different color|
|Incision||Shows no extravasated or clotted blood||Shows extravasated or clotted blood|
It is the splitting or tearing of the skin by blunt impact and occurs most commonly over bony prominences where the skin is crushed and split against the bone.
- Split/incised looking wounds – It occurs usually when the impact is perpendicular. Sites are-Flexed elbow, knee lateral and medial malleolus, sacral region and ankle
- Scratch – This is occurred due to angulated impact. It produces a flap indicating the direction of force.
- Avulsion – When horizontal impact is done the skin is separated from the depart tissues and this is called degloving injury. Sites are-Scalp, Lower and upper limb
- Tear – It is due to impact against irregular object.
Characteristics of Laceration:
The edges are irregular ragged and uneven
- The deeper tissues are unevenly divided
- If there are any hair bulbs, they will be crashed
- Blood vessels are crashed also. These resulting less external hemorrhage
- Foreign material is usually found in the wound – so preservation of wound is very important
- Generally there is no relationship between the shape and size of the wound and the weapon producing it
Medico legal Importance:
- The type of laceration may indicate the cause of injury and the shape of blunt weapon
- The age of injury can be determined
- Foreign body found in the injury indicate the circumstances in which the crime has been committed
It is a clean cut through the tissue caused by a weapon with a sharp cutting edge and its length is greater than the depth.
- Edge is clean cut, well defined and usually averted
- There are some exceptions in the scrotum and neck where there is inverted the wound. Because muscles are inserted into the skin so inversion occur (plasma and dartos muscle)
- Length is greater than depth
- There is no busing inside the edge of wound
- Blood vessels are cut across
- Bleeding is profuse
- There is a tendency to gape due to retraction of muscle fibers
Age of incised wound:
- Fresh : hematoma formation
- 12 hours : the edges are red, swollen and adherent with blood and lymph;
- 24 hours : a continuous layer of endothelial cells covers the surface
- 36 hours : the capillary network is complete
- 48 to72 hours : epidermal cells invade the space where connective tissue has finally
- 3 to 5 days : definite fibrils running parallel to the vessels are seen
- 1 to 2 weeks : scar tissue is formed.
- They indicate the nature of weapon (sharp-edged)
- They give an idea about the direction of the force
- The age of the injury can be determined
- Position and character of wounds may indicate mode of production i.e., suicide, accident, homicide.
DIFFERENCES BETWEEN Laceration (Incised looking wound) & Incised wound
|Trait||Laceration (Incised looking wound)||Incised wound|
|Production||Blunt objects||Object with sharp cutting edge|
|Site||Usually over bony prominences||Anywhere|
|Shape||Usually regular||Linear or spindle shaped|
|Margins||Irregular||Clean cut and everted|
|Dimensions||Variable||Longer than deep but often gaping|
|Hair and blood vessels||Crushed||Clean cut|
|Hemorrhage||Not pronounced. Exception scalp.||Usually profuse|
|Surroundings||Abrasion and bruising usually present.||Abrasion and bruising not present|
|Foreign bodies||Frequently present||Normally free from foreign bodies|
It is whatever the causes bodily pain, disease on infirmity is said to cause hurt.
Types– Simple and Grievous
It is neither serious nor complicated and heals up easily without leaving permanent disfiguration or deformity.
- Deprivation of the male from masculine vigor- It generally means cutting of the male organ
- Permanent privation of the sight of either eye
- Permanent privation of the hearing of either ear
- Privation of any member (functional unit) or joint
- Destruction or permanent impairing of the power of any member or joint
- Permanent disfiguration of the head or face
- Fracture or dislocation of any bone or tooth
- Any hurt which endangers life or which cause the sufferer to be during the space of 20 days in severe bodily pain or unable to follow his/her ordinary pursuits
Stab or punctured wound:
Produced from penetration of pointed instrument such as knife, dagger etc
Type : – Penetrating wound (depth > length)
– perforating wound
Concealed puncture wounds: Occurs in concealed part of the body such as nostrils,
fontanella, fornix of the upper eyelids, axilla
Defense wounds: Reaction of the victims to save him (by raising arm &
Self inflicted wounds: – By a person in his own body
– Motive to draw attention
Fabricated or false wounds: – By a person in his own body or by another person with his
– Motive to implicate someone
Cause of death
Injuries occur at various parts of the body. So they are classified as regional injuries according to site of injuries for better investigation and description.
Sites of regional injuries:
- Head and Spine
Head is the most vulnerable site of injury because –
CMIT 424: Digital Forensics Analysis and Applica±on (Spring 2016)Detailed Assignment Descrip±on for Forensic Report #2The purpose of this assignment is to determine if you can Properly process and handle evidence for a case and perform other case management func±onsComply with laws, regula±ons, policies, procedures, and ethical constraints which apply to a caseoDevelop and document a minimum set of policies and procedures required for the professional prac±ce of digital forensics. (See report outline.)Select and use appropriate digital forensics toolsProcess an evidence drive by using a forensic tool to view and analyze par±±ons, folders, andFles to answer ques±ons posed by a client and to iden±fy addi±onal ques±ons that should be askedRecover and analyze speciFc Fle types and contentsoEmail FlesoEncrypted or password protected FlesoInternet Explorer cache FlesoMS O²ce documents, spreadsheets, and presenta±ons (including metadata)oWindows Registry FlesoText FlesoOther Fle types as found in the imagePerform keyword driven searches to iden±fy Fles and other digital ar±facts of forensic interest to the casePerform Fle carving to recover orphaned Fles and then iden±fy which carved Fles contain informa±on of forensic interest to the case.Properly recover and handle contraband (adult and child pornography, evidence related to narco±cs)Write a reasonably professional comprehensive (full) report of a forensic examina±on Required Deliverables:1.³orensic Report #2 ³ile containing:a.Transmi´al Le´erb.Delivery Package Inventoryc.³orensic Report (³ull) and all appendices2.Chain of Custody Document3.List of MD5 Hash Values for all Fles submi´ed for this assignmentCopyright © 2015 by University of Maryland University College. All Rights Reserved.