Forensic Identification Methods

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Questions and Answers

What is the primary advantage of using DNA profiling for identification purposes?

  • DNA profiling is cheap and readily available.
  • DNA profiling is highly specific to individuals, making it a strong tool for identification. (correct)
  • DNA profiling doesn't require any prior information about the individual being identified.
  • DNA profiling is relatively simple to perform and requires limited equipment.

What percentage of the DNA molecule is used for genetic coding?

  • 1%
  • 10% (correct)
  • 100%
  • 50%

What are 'silent zones' in DNA?

  • Regions of DNA that are responsible for regulating gene expression.
  • Sections of DNA that are not involved in genetic coding. (correct)
  • Areas of DNA that have been damaged or mutated.
  • Parts of DNA that code for inactive genes.

Which of these techniques can be used for identification when other methods are not feasible?

<p>DNA profiling, gait analysis, facial profiling. (D)</p> Signup and view all the answers

Why is contamination a major concern in forensic DNA analysis?

<p>Contamination can introduce extraneous DNA into the sample, making it difficult to distinguish between individuals. (C)</p> Signup and view all the answers

What is the role of 'standard operating procedures' in preventing contamination in forensic DNA analysis?

<p>They establish guidelines for proper handling and processing of evidence. (C)</p> Signup and view all the answers

What is the significance of the 'double helix structure' in DNA?

<p>It allows for efficient replication and transmission of genetic information. (C)</p> Signup and view all the answers

Why is it crucial to wear protective clothing during forensic DNA analysis?

<p>To protect evidence from contamination by investigators' own DNA. (A)</p> Signup and view all the answers

At what stage does the growth of the penis start to increase in breadth?

<p>Stage 4 (D)</p> Signup and view all the answers

What is the primary physical characteristic that marks the onset of puberty in girls?

<p>Menarche (A)</p> Signup and view all the answers

Which Tanner stage corresponds to the development of a breast bud in girls?

<p>Stage 2 (A)</p> Signup and view all the answers

What physical characteristic is associated with the onset of menarche in girls?

<p>Prominent areola and papilla (C)</p> Signup and view all the answers

At which Tanner stage does the scrotum become darker and larger?

<p>Stage 3 (A)</p> Signup and view all the answers

Which stage is characterized by the presence of few, fine pubic hairs in girls?

<p>Stage 2 (B)</p> Signup and view all the answers

In Stage 4, what is the characteristic appearance of pubic hair in girls?

<p>Adult type, smaller (C)</p> Signup and view all the answers

Which stage signifies the completion of physical maturation?

<p>Stage 5 (B)</p> Signup and view all the answers

Which method is primarily discussed for age estimation based on skeletal remains?

<p>Cranial metrics (C)</p> Signup and view all the answers

What does the research suggest about growth and sexual maturation?

<p>There are variations in pubertal changes between genders. (B)</p> Signup and view all the answers

Which scholarly work focuses on the accuracy of fingerprint examiners?

<p>Accuracy and reliability of feature selection (D)</p> Signup and view all the answers

What type of imaging technique is highlighted for age estimation in living individuals?

<p>Magnetic resonance imaging (B)</p> Signup and view all the answers

What is a key indicator used to estimate age from the remains?

<p>Tooth eruption sequence (B)</p> Signup and view all the answers

Which publication focuses on the criteria for age estimation in living individuals?

<p>The Encyclopedia of Forensic and Legal Medicine (A)</p> Signup and view all the answers

What aspect does the work of Liversidge and Molleson primarily address?

<p>Tooth length as an estimate of age (A)</p> Signup and view all the answers

Why is the study of juvenile osteology significant in forensic science?

<p>It helps in estimating age in living individuals. (C)</p> Signup and view all the answers

What is the primary purpose of photographing the deceased at the scene?

<p>To assist in the identification process (D)</p> Signup and view all the answers

Which type of evaluation is needed for social and psychological assessment of age?

<p>Assessment by a highly trained clinician (A)</p> Signup and view all the answers

What is the significance of retrieving personal items from the deceased's home?

<p>To potentially yield identifying evidence (D)</p> Signup and view all the answers

What determines the range of age estimation in a deceased individual?

<p>Specific calendar date and a one-year range (A)</p> Signup and view all the answers

What must be assessed by a qualified clinician for external estimation of age?

<p>Age through external characteristics (D)</p> Signup and view all the answers

What happens if the identification evidence does not meet the required standards?

<p>More evidence must be collected (C)</p> Signup and view all the answers

Which professionals might be appropriate for the examination of an elderly individual?

<p>Forensic physician or geriatrician (D)</p> Signup and view all the answers

Why is having multiple practitioners assess an individual sometimes necessary?

<p>To increase the chances of accurate identification (B)</p> Signup and view all the answers

What was the main focus of the study conducted by Shrestha et al. in 2018?

<p>Identification of disaster victims (C)</p> Signup and view all the answers

Which publication discusses the estimation of dental age in adults?

<p>A New Method for Dental Age Estimation (D)</p> Signup and view all the answers

What method did Wadhwani et al. study in relation to dental records?

<p>Maintenance of antemortem dental records (C)</p> Signup and view all the answers

Which reference provides clinical longitudinal standards for physical growth parameters?

<p>Physical Growth from Conception to Maturity (A)</p> Signup and view all the answers

Which of the following studies focuses on bitemark casework analysis?

<p>Reality Bites: A Ten-Year Retrospective (A)</p> Signup and view all the answers

What does the study by Tabasum et al. relate to in forensic science?

<p>Sex estimation from dental samples (A)</p> Signup and view all the answers

Which study introduces a new multiplex-PCR for DNA analysis in forensics?

<p>Analyzing Highly Degraded Material (A)</p> Signup and view all the answers

What type of records did Wheeler study concerning physical changes during puberty?

<p>Longitudinal standards for height and weight (B)</p> Signup and view all the answers

What type of marks on the body can be used to identify a person?

<p>All of the above (D)</p> Signup and view all the answers

What is the primary use of tattoos and piercings in forensic medicine?

<p>To identify the body of an unknown person (C)</p> Signup and view all the answers

Why is it important to record all visible scars, marks, and deformities on a body?

<p>To assist with identification (A)</p> Signup and view all the answers

Why is appropriate photography of scars, marks, and deformities recommended?

<p>To allow others to confirm identity based on these features (A)</p> Signup and view all the answers

In the case of a deceased body, what should be taken to aid in identification?

<p>High-quality photographs of the face (C)</p> Signup and view all the answers

When skeletal remains are found, what expert is often needed to assist in identification?

<p>Anthropologist (B)</p> Signup and view all the answers

What is the key factor in utilizing tattoos for identification?

<p>The individualization of the tattoo design and its specific personal information (A)</p> Signup and view all the answers

When might pre-mortem clinical radiological images be useful ?

<p>To compare with post-mortem films for definitive identification (A)</p> Signup and view all the answers

Flashcards

DNA Profiling

A technique used to identify individuals based on unique DNA characteristics.

Double Helix Structure

The formation of DNA consisting of two strands twisted together.

Genetic Coding

The part of the DNA molecule that contains the instructions for building proteins.

Silent Zones

Regions of DNA that do not code for proteins but have repeating sequences.

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DNA Contamination Risk

The potential for unwanted DNA to mix with samples during analysis.

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Standard Operating Procedures

Protocols established to prevent contamination during DNA handling.

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Gait Analysis

Techniques used to identify individuals based on their walking patterns.

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Facial Profiling

The analysis of facial features from images or video for identification.

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Tanner Stage 1

Pre-adolescent stage for both boys and girls, showing no sexual characteristics.

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Tanner Stage 2 Boys

Boys show scrotum changes and slight penis enlargement, indicating early puberty.

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Tanner Stage 2 Girls

Breast bud development occurs in girls, marking the start of puberty.

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Tanner Stage 3 Boys

Boys experience longer penis and larger testes without nipple contour separation.

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Tanner Stage 3 Girls

Breasts grow larger but without defined contour, and begins to darken and coarsen pubic hair.

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Tanner Stage 4 Boys

Penis increases in breadth, and the scrotum darkens; fathered changes continue.

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Tanner Stage 4 Girls

Breasts have mature type with areola and pilla projecting from secondary mound; menarche usually starts.

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Tanner Stage 5

Adult size and development achieved in both boys and girls, with fully mature sexual characteristics.

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Body Recovery

The process of identifying and photographing deceased individuals for investigation.

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Legal Process

The procedures followed to assist investigations and establish cause of death.

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Age Estimation

Using DNA and personal clues to approximate the age of an individual.

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Identity Standards

Criteria set by the Identification Commission to confirm an individual’s identity.

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Family Liaison Officer

A person who helps communicate between investigators and the deceased's family.

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Identification Evidence

Items such as fingerprints, DNA, or dental records used to verify identity.

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Social Evaluation

Assessment by trained professionals to establish age or identity based on social factors.

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External Estimation

Age assessment performed by a qualified clinician, often for living individuals.

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Stature Estimation Formulae

Equations used to estimate the height of individuals based on skeletal measurements.

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Dental Age Estimation

A method to estimate the age of an individual based on their dental development.

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Odontometric Sex Estimation

Determination of an individual's sex using measurements of teeth.

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Cranial Morphometric Analysis

Study of skull shape to identify ancestry and sex differences.

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Multiplex-PCR

A technique to amplify DNA using multiple specific primers for analysis.

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Longitudinal Standards for Growth

Established benchmarks for monitoring physical development in children.

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Skeletal Maturity Estimation

Assessment of skeletal development to determine maturity level.

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Antemortem Dental Records

Dental records kept prior to death used for identification post-mortem.

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Forensic Identification

The process of determining the identity of a person using various features such as tattoos and scars.

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Tattoos in Forensics

Unique markings on the skin that can aid in identifying individuals when found on remains.

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Importance of Photographs

High-quality images are crucial for confirming identities through visible features post-mortem.

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Surgical Scars

Marks left from surgical procedures that can be significant for identification.

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Ethnic and Racial Aspects

Features related to a person's ethnicity or race that may help in identifying individuals.

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Decomposed Remains

Human remains that have broken down over time and may need specialized methods for identification.

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Role of Pathologists

Medical experts who aid in identifying remains through analysis of body structure and cause of death.

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Comparative Radiology

Using medical imaging from before death to assist in confirming identity after death.

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Stature Estimation

The process of estimating an individual's height using various methods, such as cranial metrics.

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Cranial Metrics

Measurements taken from the skull to help estimate demographics like ancestry and stature.

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Age Estimation Techniques

Methods used to determine the age of individuals, particularly through dental and skeletal analysis.

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Radiographic Age Determination

Using radiographs to assess the age of adults based on skeletal features.

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Juvenile Osteology

The study of juvenile skeletal remains to understand growth and development stages.

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Permanent Tooth Length

A measurement used to estimate age based on the length of a person's permanent teeth.

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Clavicular Ossification

The process of bone formation in the clavicle, used as a timeline marker for age estimation.

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Pubertal Changes

Variations in physical developments during puberty that can indicate age and maturity.

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Study Notes

Introduction

  • Loss of identity is a significant problem in medico-legal settings
  • Loss can be deliberate (e.g., concealment for criminal reasons) or unintentional (e.g., disasters)
  • Formal identification of bodies is crucial in medico-legal investigations
  • Visual identification is often impossible due to factors like trauma, decomposition, or deliberate mutilation
  • Governments require systems for rapid identification of casualties in mass disasters

Methods of Identification

  • Primary criteria are fingerprints, DNA, and dental records.
  • Secondary criteria include medical characteristics, deformities, scars, radiological evidence, personal effects, and clothing.
  • The reliability of fingerprint and dental assessments has been questioned in recent times.

DNA Profiling

  • DNA profiles are unique to individuals, except for identical twins.
  • The DNA molecule is a double helix structure
  • Different genetic material is present in silent zones (non-coding regions)
  • Forensic genetics is based on Restriction Fragment Length Polymorphisms (RFLP) or more recently Short Tandem Repeats (STR) sequences.
  • PCR (polymerase chain reaction) amplifies STR sequences for analysis from a small sample
  • DNA comparisons with known family members or databases are used for identification
  • Risk of contamination (at crime scenes) is a critical issue in DNA analysis.

Examination of Dental Structures

  • Forensic odontology is crucial for identifying unknown bodies even with severe damage.
  • Identification relies heavily on antemortem records (from dentists).
  • Comparison of the antemortem and postmortem dental records (charts, X-rays) establishes identity.
  • Dental charts are sometimes inadequate due to insufficient documentation practices

Fingerprints

  • Fingerprints can be used in identification procedures.
  • Specialized techniques are used for recovery, especially on damaged bodies.

Morphological characteristics

  • Identity is determined by matching features with documented information from living person
  • This may include height, weight, BMI, hair colour, beard (or moustache)
  • A number of factors that may affect age estimations.

Tattoos and Body Piercings

  • Tattoos and body piercings can be used in forensic identification.
  • The criteria used for identification rely on design and location.
  • Visual identification comparison is often needed with available ante mortem images.

Age Estimation

  • Various techniques are used for living people (social/psychological evaluation; external, skeletal, dental).
  • Age estimation in the deceased is complex and depends on multiple factors and practitioners.

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