Landmark NS 2232 - Trace Evidence (14 pages)

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Trace Evidence



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Trace Evidence

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Pages:
14
School:
Landmark College
Course:
Ns 2232 - Introduction to Forensic Science
Introduction to Forensic Science Documents

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Trace Evidence Hair NS2232 Littlefield 1 Trace Evidence any small pieces of Evidence any material manman made or naturally occurring Most common examples Hair Fiber NS2232 Littlefield Questions for Trace Evidence What is it Is it manman made or natural What is its source How common is it Can it be identified to a single source NS2232 Littlefield 1 From hair one can determine Human or animal Race Origin Manner in which hair was removed Treated hair Drugs ingested NS2232 Littlefield 2 Hair Structure Hair Cuticle Scale Types Mosaic Pectinate Imbricate Petal Diamond petal Chevron NS2232 Littlefield Scale Types Mosaic Chevron 3 Scale Types cont Diamond Petal Petal Scale Types cont Pectinate Imbricate Human Hair 4 Human Hair Cat Hair Cow Hair 5 Dog Hair Bat Hair Hair Structure 6 Hair Cortex The cortex gives the hair its shape It has two major characteristics Melanin Cortical fusi NS2232 Littlefield Hair Structure Hair Medulla Types Continuous Intermittent or interrupted Fragmented not Absent Absent not present NS2232 Littlefield 7 Hair Medulla Patterns Uniserial Multiserial Vacuolated Lattice NS2232 Littlefield Human medulla Human medulla may be continuous fragmented or absent 8 Rabbit medulla Double Medulla Medullary Index Medullary Index for human hair is generally less than 1 3 For animal hair it is usually greater than 1 2 9 Hair Growth hair Anagen Anagen hair that is growing hair Catagen Catagen hair at rest hair Telogen Telogen hair that is dying NS2232 Littlefield How When Did It Leave Anagen Telogen Ethnicity Asian Black Caucasian 10 Cross Sections Black Caucasian Asian Dyed Human Hair DNA Mitochondrial Nuclear NS2232 Littlefield 11 Collection of Hair Evidence Questioned hairs Known Control Sample 50 fullfull length hairs from all areas of scalp 24 fullfull length pubic hairs NS2232 Littlefield Hair Toxicology Advantages Easier to collect and store Is externally available Can provide information on the individual individual s history of drug use Collections must



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