PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network

Physical Evidence Manual
eliminate saliva, semen, and trace evidence deposited on the exterior of the
body.
Undergarments, worn by the victim during and/or immediately after the assault,
are also good sources for collecting semen and hair evidence. Package each
clothing item separately.
Penile Swabbing Evidence Kits
If a male suspect is taken into custody within 18 hours of the incident and he has
not showered or bathed, a Penile Swabbing Evidence Kit provided by the
Forensic Services Division should be collected.
The suspect’s underwear should also be collected as such evidence may provide
an excellent source of the victim’s DNA.
Standards
Standards need to be obtained from all individuals believed to be involved in the
incident. This includes the victim(s), suspect(s), and in a rape situation, any
recent (within 3 days) sexual partner(s). The DNA from the evidence is compared
to those standards to determine who the donors are or are not.
Both blood and oral swab standards are currently acceptable for use as a DNA
standard.
Blood Standards
1. Collect at least one tube of blood into a lavender top tube, which contains
the preservative EDTA.
2. Label the tube with the individual’s name and date collected, then seal it in
a box or padded envelope to prevent breakage.
3. Never store liquid blood tubes in the freezer. Refrigerate them instead.
Oral Swab Standards
1. Vigorously swab the cheek and gums of the mouth, one swab at a time,
until 4-6 swabs are collected. The individual may do this him/herself under
your direct supervision.
2. Allow the swabs to air-dry.
3. Seal in a paper envelope labeled with the individual’s name, date, and
“Oral Swab Standard.”
Human Remains
Adopted: May 2002
Revisions: 6
Last Revision: January 31, 2008
6-6