-answers specific questions in a cease
-did this bullet pass through the victim?
Whose pocket was the gun in?
Linking two items to the same evident
Must be anticipated from the beginning of a case.
Trace evidence can provide a description of objects of materials that a subject had contact with
Most suitable in stranger abduction type case
Decomposition cases are sometimes suitable
Need good scene exemplars
Need victim exemplars
IS it from the suspect environment
Preponderance of a type of fiber/particle
Location of fiber/pa