Performance Task 4 Forensic 4, Cheat Sheet of Forensics

Download Performance Task 4 Forensic 4 and more Cheat Sheet Forensics in PDF only on Docsity! GUINGON, JHON CLEOFERD C. 3RD YEAR BS- CRIMINOLOGY FORENSIC 3                      PERFORMANCE TASK 6 1.) Identify the parts of human hair and hair shaft. ⭕ Each hair has three layers: the medulla (pronounced: meh-DULL-uh) at the center, which is soft. the cortex, which surrounds the medulla and is the main part of the hair. the cuticle (pronounced: KYOO-tuh-kull), the hard outer layer that protects the shaft. 2.) Identify the sources of hair evidence. Samples can be tested to determine the color, shape and chemical composition of the⭕ hair, and often the race of the source individual. 3.) Describe the significant role of human hair as evidence. Humans shed an average of approximately 100 head hairs per day, and because hair ⭕ can be easily transferred during physical contact it is commonly submitted as forensic evidence to help establish associations between people (e.g. a victim and suspect) and/or people and a crime scene.  4.) Describe the hair analysis in the lab.  ⭕ Hair analysis can be used to check if people are blood relatives. Forensic hair analysis can be done to help identify a criminal by evaluating hair structure and DNA from cells attached to the root of the hair. Hair samples are tested with specific chemicals and looked at under a microscope. Hair analysis is done by collecting a hair sample and sending it to a laboratory. If a DNA test is done on the hair, then the hair collected needs to have the root attached. Hair samples are taken from a specific part of the body, such as from the back of the scalp by the neck or from the pubic area.  Its most widely accepted use is in the fields of forensic toxicology and, increasingly, environmental toxicology. Several alternative medicine fields also use various hair analyses for environmental toxicology, but these uses are controversial, evolving, and not standardized. Microscopic hair analysis has traditionally been used in forensics as well. Analysts examine a number of different characteristics of hairs under a microscope, usually comparing hair taken from a crime scene and hair taken from a suspect. It is still acknowledged as a useful technique for confirming that hairs do not match. But DNA testing of evidence has overturned many convictions that relied on hair analysis. Since 2012, the Department of Justice has conducted a study of cases in which hair analysis testimony was given by its agents, and found that a high proportion of testimony could not be supported by the state of science of hair analysis. 5.) Show the significance role of fiber as evidence.  ⭕ Fibers are considered a form of trace evidence that can be transferred from the clothing of a suspect to the clothing of a victim during the commission of a crime. Fibers can also transfer from a fabric source such as a carpet, bed, or furniture at a crime