Sample interview questions: How would you handle the collection and preservation of biological evidence at a crime scene?
Sample answer:
Collection of Biological Evidence:
- Visual Examination: Conduct a thorough visual search of the crime scene for all potential biological materials, including blood, saliva, semen, hair, fibers, and skin cells.
- Photography: Document the location and condition of all biological evidence using high-resolution photographs.
- Collection Tools and PPE: Use sterile equipment (e.g., swabs, scalpel blades, tweezers) to collect biological materials and wear appropriate personal protective equipment (e.g., gloves, mask).
- Packaging: Place collected evidence in airtight containers (e.g., sterile tubes, paper envelopes) labeled with the date, time, location, and type of sample.
- Chain of Custody: Establish a clear chain of custody to track the movement and handling of all biological evidence from collection to analysis.
Preservation of Biological Evidence:
- Environmental Control: Store biological evidence in a cool, dry, and protected environment to minimize degradation.
- Refrigeration: Refrigerate perishable samples (e.g., blood, saliva) to slow down decomposition.
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