Forensic Characterization of Semen. The presence of seminal stains is important in crimes involving sexual offenses. Two steps: Stains must be located Stains are tested to determine identity. Testing for Seminal Stains.
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Figure 8-18 An antibody–antigen–antibody sandwich or complex is seen as a colored band. This signifies the presence of PSA in the extract of a stain and positively identifies human semen.
Physical evidence collected from a rape victim include:
Evidence of rape is not limited to semen
If semen is detected, but contains no spermatozoa, how do you prove presence of semen?