Forensics science involves using scientific techniques in a__ investigation and trial. __ evidence refers to guns, knives, bloody shirts, or even documents found at a__ scene. __ evidence refers to very small pieces evidence like strands of hair,skin cells, or fingerprints. Temperature is an important indicator telling investigators when a person died, usually called __. Another factor __ investigators look for on a dead body is __ . A few hours after a person dies, the joints of a dead body stiffen and become locked in place.