Trace Evidence - Individual vs. Class Evidence

Trace Evidence - Individual vs. Class Evidence

Notes on page 27 in notebook A very small piece of physical evidence that can be used to

identify or link a suspect to a crime 1670 Anton von Leeuwenhoek constructs first microscope Very important in analyzing trace

evidence Derived from Edmond Locards Exchange Principle Every contact leaves a trace There will be small transfer of evidence during the commission of the crime

Divided into individual or class evidence Individual evidence shows an objects uniqueness

Can specifically place things to a person or a place or an object to the exclusion of all others DNA, fingerprints, some footwear impressions, bite marks, bullets Class evidence can place an

object to a group, but not to an individual Will include a group of suspects Examples: fibers, paint, soil, glass A student is kidnapped on the way home from school. Her backpack is

found on the side of the road. There are several strands of hair caught in the zipper. Is this individual or class evidence? Explain why. Case #1 Case #7 Case #2

Case #8 Case #3 Case #9 Case #4 Case #10

Case #5 Case #11 Cast #6 Case #12

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