FRSC 2001 – Introduction to Forensic Science Technology II Trace Evidence Part I: Glass, Paint, and Soil Evidence Professor Bensley Alfred State College.

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FRSC 2001 – Introduction to Forensic Science Technology II Trace Evidence Part I: Glass, Paint, and Soil Evidence Professor Bensley Alfred State College

Trace Evidence Very common form of physical evidence Very common form of physical evidence Name some examples of trace evidence…. Name some examples of trace evidence…. Locard Exchange Principle When a person comes in contact with another person or an object, a cross- transfer of materials occurs

Types of Glass Soda-lime glass Soda-lime glass Most window and bottle glass Most window and bottle glass

Types of Glass Float Glass Float Glass Type of soda-lime glass – Produces very flat glass used in windows (plate glass windows) Type of soda-lime glass – Produces very flat glass used in windows (plate glass windows)

Types of Glass Borosilicates Borosilicates Automobile headlights, heat-resistant glass like Pyrex – add Boron oxide to the oxide mix Automobile headlights, heat-resistant glass like Pyrex – add Boron oxide to the oxide mix

Types of Glass Tempered Glass Tempered Glass Side and rear windows of cars Side and rear windows of cars Large patio doors Large patio doors

Types of Glass Laminated Glass Laminated Glass Used in windshields of cars Used in windshields of cars

Paint Evidence What is paint? What is paint? Pigments, Additives, Binders, Solvents Pigments, Additives, Binders, Solvents Is all paint alike?What about automobile paint? Is all paint alike?What about automobile paint? Electrocoat Primer Primer Surfacer Basecoat Clearcoat

Soil Analysis

Microscopic Examination Microscopic Examination Sieving Sieving Density-Gradient Tubes Density-Gradient Tubes