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evidence

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transient evidence
temporary; easily changed or lost; usually observed by the first officer at the scene
pattern evidence
produced by direct contact between a person and an object or between two objects
conditional evidence
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
transfer evidence
--produced by contact between person(s) or object(s), or between person(s) and object(s)
associative evidence
--items that may associated a victim or suspect with a scene or each other; ie, personal belongings
recognition
ability to distinguish important evidence from unrelated material
preservation
the collection and proper packing of evidence
identification
using scientific testing
comparison
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
individualization
in demostrating that the sample even among members of the same class
interpretation
giving meaning to all information
indirect evidence
does not prove a fact
circumstance evidence
a fact or event without actually proving it
biological
blood , semen. silva , sweat etc
chemical
fibers , glass, soil. gunpowder
physical
fingerprints , footprints , shoeprints ,
miscellaneous
laundry marks voice analysis polygraph