CRM/LAW C105 Lecture Notes - Lecture 9: Csi Effect, Trawling, Confirmation Bias
14 Mar 2016
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People v wesley, 1988 first time dna entered in court. Measures must be reliable and valid this requires testing: reliability = consistency ; need reliability to have validity. Inclusion of all other fingerprints in the world : dna identification good but not perfect. Forensic dna evidence random match probability chance of two dna samples matching; how common the profile is in a given population. Rmp = 0. 001% vs. 1/100,000 : people think percentage is more rare than fraction: prosecutor"s fallacy. Rmp = 1% -> prob(guilt) = 99% prosecutor makes argument that if probability is 1% then 99% chance that defendant is guilty. P(m/i) = 1% not same as p(i/m) = 1% -> pg(99%: defense attorney"s fallacy. Probative value: evidence is relevant if it has any tendency to make a fact more or less probable than it would be without the evidence. Rmp don"t really have much of an effect jurors are insensitive to lab errors.
