Why is proper packaging of biological evidence important?

• A. Each stained object should be packaged separately to prevent contamination and maintain integrity.
• B. Evidence should be packaged together in a single bag to save space.
• C. Packaging is not important for DNA.
• D. Wet items can be packaged with dry items.

Answer: (A)

Proper packaging protects the evidence from contamination and preserves the DNA for accurate testing. The best choice reflects this by recommending that each stained object be packaged separately. Keeping items in individual, labeled containers prevents material from one item transferring to another during handling or transport, which could create false associations or obscure the original evidence. It also helps maintain the item’s condition, including moisture level and potential contaminants, so the lab can analyze each piece on its own terms and maintain a clear chain of custody. Packaging items together risks cross-contamination and degradation, while treating all items as unimportant to packaging is incorrect, and mixing wet with dry items can promote mold and DNA degradation.