ETX 20 Lecture Notes - Lecture 5: Repeatability, Arnould Locard, Testability
1 Jul 2016
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Document Summary
Death and violent crime scene investigations, part 2. What do they determine: if the defendant is guilty. How do they determine this: statements of witnesses. Evidence is given in a legal investigation to make a fact or proposition more or less likely. Two key examples: real evidence -- recovered from a crime, demonstrated evidence -- created later to clarify/explain. Conditions that affect transfer: pressure applied during contact, number of contacts, how easily the item transfers material, form of evidence, how much of the item is involved in the crime scene. Locard exchange principle: when two things come in contact, Result of transfer: proxy data, like remnants/history of that. Persistence transfer: further transfers, over time, evidence degrades, collected as evidence. Identity: examination of chemical and physical properties of an object. Class: flexible definition used to further sub-categorize within a group. Class identity may indicate a common source. Individualization: object classified into a group with only one member (itself)
