FSC239Y5 Lecture Notes - Lecture 2: Nylon, Ninhydrin, Combined Dna Index System
Document Summary
September 12, 2017: lo(cid:272)ard"s pri(cid:374)(cid:272)iple, crime scene evidence, various databases. Individual vs class characteristics: locard"s principle, every contact leaves a trace. Individual characteristics may or may not be present: class characteristics, properties of evidence that can be associated only with a general group and never a single person. Colour layers to individual a paint chip to a vehicle. # ridge characteristics individualize a fingerprint: weight or significance applied to physical evidence is left to trier of fact (judge, jury) Important for expert witnesses to stay within their area of expertise: avoid absolute terms (ie. , item a matches with b, statements made traceable back to the scientific literature. Incidentally, a two-way transfer was observed: alloy composition, counterfeit: suspected counterfeit ttc tokens were examined and determined to be composed of a different alloy than that used to produce authentic ttc tokens. Ignitable liquid residue identification in arson investigation: fire debris: identified as gasoline. Ink/toner analysis: different toner = different chemicals.
