How can you minimize DNA contamination during evidence collection at a scene?

How can you minimize DNA contamination during evidence collection at a scene?

• A. Use new gloves for each item, change gloves between items, sterile tools, avoid touching DNA-rich areas, and segregate evidence.
• B. Use the same gloves for all items to save time.
• C. Handle DNA-rich areas with gloves off
• D. Allow evidence to touch any surface before packaging

Answer: (B)

Preventing DNA contamination means using strict hand- and tool-hygiene so DNA from one item doesn’t transfer to another. The best approach is to wear fresh gloves for each item and change gloves between items, use sterile tools, avoid touching DNA-rich areas, and segregate evidence during collection and packaging. Gloves and tools can carry trace DNA, so switching gloves prevents cross-transfer from item to item, while sterile tools minimize carryover. Handling DNA-rich areas with gloves on can still transfer skin cells or DNA to other surfaces, and letting evidence touch unclean surfaces or equipment before packaging increases contamination risk. By keeping items separated and using proper, clean handling for each item, you maintain the integrity of the evidence and preserve its forensic value.