PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network

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Physical Evidence Manual below or consult the section specific to the type of evidence you have to select the proper way to package it. All packaging types need to be clean and unused (e.g. no recycled grocery bags). Table 1: Evidence Packaging Packaging Type Uses Paper bags or envelopes Any biological material that includes marijuana, psilocybin mushrooms, blood or semen stained items, condoms, etc. If unable to air-dry prior to packaging, submit to the laboratory as soon as possible and notify them that it is a wet sample. Plastic bags or Ziplocs A non-biological material such as powder drug samples Metal cans Arson evidence Plastic buckets Samples from clandestine laboratories that are individually packaged in glass vials and set in an absorbent material (e.g. vermiculite, kitty litter, etc.) in the plastic bucket. Glass vials Liquid drug samples, syringe contents, samples Paper folds 1 and Post-It notes, then placed into a clean envelope from clandestine laboratory, etc. 1 See “Appendix A” for instructions on making paperfolds. Adopted: May 2002 Revisions: 6 Last Revision: January 31, 2008 Small pieces of trace evidence, hairs, fibers, minute glass particles, paint chips, residue amounts of powder drugs, etc. Place inside a larger paper envelope. Use a Post-It note by placing the trace evidence on the adhesive and folding the Post-It in half to cover the adhesive. Cardboard boxes Firearms, knives, large pieces of plate glass, a piece of flooring with a shoeprint, etc. Offers protection from sharp edges and the depth protects one surface of the evidence from rubbing. 4-5
Physical Evidence Manual Sealing A proper seal ensures that evidence has not been accessed, altered, compromised, or lost during storage. A good seal is tamper-proof, is detectable if tampered with, and is initialed and dated across the seal. The laboratory cannot accept evidence that is not sealed. This is a policy of the Forensic Services Division as stated in its Operations Manual. Table 2: Evidence Sealing Do Use Don’t Use Evidence tape (tamper-proof) Staples Heat seals Masking tape or Scotch tape Paper clips, binder clips, etc. Figure 1: The bag shown at left is properly sealed with evidence tape. The bag at right is not; evidence could be lost or accessed through the portions that are not secured. Adopted: May 2002 Revisions: 6 Last Revision: January 31, 2008 4-6
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PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network

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