CRIM 355 Chapter : Crim 355 Text Notes.docx
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Examples: paint (b&e"s, glass, fibers, drywall, glue, cleaner fluid, adhesive tape (assault where people are bound) Basic training in lab under a mentor (15 months) Not useful without a comparison database to determine probability of someone else have that evidence. Example :glass at a scene: how common is that sort of glass. Glass on regular people: mall study, how much class on them, on shoes ~30, clothes ~ 2% Does it fit this person-how likely is it this person could innocently have this evidence. Glass on clothing is rare, but what if the guy is a glazer. Some things are very common in some situations and very rare in others. More than one type of class evidence. The more there is the more significant multiple probabilities. Polymers- eg. nylon (large number of atoms) Characteristics: color, striations on fibre, cross-sectional shape, refractive index. Cars- all have atleast 4 layers normally (could have as many as 7)