DNA Evidence
Informed
Note: Ensure Officer Safety – Be Careful With Biohazards
1. Avoid Contamination
Wear gloves — change them often
Use disposable instruments or clean them thoroughly before & after handling each sample
Avoid touching area where you believe DNA may exist
Avoid talking, sneezing, & coughing over evidence
Avoid touching your face, nose, and mouth when collecting & packaging evidence
Air-dry evidence thoroughly before packaging
Put evidence into new paper bags or envelopes
DO NOT use plastic bags
DO NOT use staples
2. Transportation & Storage
Keep evidence dry & at room temperature
Once packaged – seal & label
3. Document
Location found
Chain of custody
4. Collect Elimination Sample(s)
Determines if DNA is from suspect or other(s)
Used for comparison
Homicide: victim (even if decomposed)
Rape: victim’s recent consensual partners (approach victim with extreme sensitivity & provide full explanation for request. Consider having victim advocate present)
Burglary: other persons at residence / building
Next: Seizure of Electronic Evidence
Previous: Incident Management
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