FRSC 302 Lecture Notes - Lecture 10: Type I And Type Ii Errors, Statistical Hypothesis Testing

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FRSC 302
WEEK 9 RECOGNITION OF TRACE EVIDENCE NOTES
Known and Questioned Items
Questioned items do not know the original source of the item
Known evidence known where the sample originated
Relationships and Context
The relationship between people, places and things involved in crimes are critical when
deciding what to examine and how to interpret results
If two things, which have previously never been in contact with each other, have items
on them which are analytically indistinguishable at a certain class level, the question of
coincidental association arises
Important to establish context of the crime and those involved
Helps to determine what evidence is significant, methods to be most effective for
collection or analysis, and what may be ignored
Using context for direction prevents the indiscriminate collection of items
Comparison of Evidence
Two fundamental processes in analysis of evidence
o Identification process of discovering physical evidence
o Comparison establish the source of evidence, questioned evidence is
compared with objects whose source is known
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Document Summary

Questioned items do not know the original source of the item. Known evidence known where the sample originated. The relationship between people, places and things involved in crimes are critical when deciding what to examine and how to interpret results. If two things, which have previously never been in contact with each other, have items on them which are analytically indistinguishable at a certain class level, the question of coincidental association arises. Important to establish context of the crime and those involved. Helps to determine what evidence is significant, methods to be most effective for collection or analysis, and what may be ignored. Using context for direction prevents the indiscriminate collection of items. Two fundamental processes in analysis of evidence. Identification process of discovering physical evidence: comparison establish the source of evidence, questioned evidence is compared with objects whose source is known. Examine for common physical and/or chemical characteristics that exist between both samples.

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