 Forensic
Science Laboratory
 riminalistics
is the unit of the Forensic Sciences Division, commonly referred
to as the "Crime Lab", is responsible for analysis
of all physical evidence, other than controlled substances or
firearms, related to crimes of violence and property. Typical
examples are: homicide, assault, sexual assault, burglary, etc.
Critical analysis is performed in three categories: (1) Trace
evidence, like paint, fibers, gunshot residue; (2) Biological
evidence - blood, semen, hairs and (3) Miscellaneous evidence
- footwear impressions, arsons.
The Unit plays a major role in linking defendants to a crime
with physical evidence comparisons, and resolving conflicting
statements from witnesses.
The Philadelphia Police Department's Criminalistics Unit maintains
itself as a full-service facility, able to perform a wide variety
of testing procedures. All of the scientists in the unit testify
in court regularly.
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