temporary; easily changed or lost; usually observed by the first officer at the scene
produced by direct contact between a person and an object or between two objects
produced by a specific event or action; important in crime scene reconstruction and in determining the set of circumstances or sequence within a particular event
--produced by contact between person(s) or object(s), or between person(s) and object(s)
--items that may associated a victim or suspect with a scene or each other; ie, personal belongings
ability to distinguish important evidence from unrelated material
the collection and proper packing of evidence
using scientific testing
class characteristic measured against those of known standard or controls ,if all measurements are equal , then the two samples may be considered to have come from the same origin
in demostrating that the sample even among members of the same class
giving meaning to all information
does not prove a fact
a fact or event without actually proving it
blood , semen. silva , sweat etc
fibers , glass, soil. gunpowder
fingerprints , footprints , shoeprints ,
laundry marks voice analysis polygraph
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