In the context of evidence handling for DNA analysis in sexual assault investigations, which practice supports maintaining the integrity of DNA evidence?

• A. Exposing samples to heat/light to test stability.
• B. Preserve DNA samples, document chain of custody, and coordinate with labs for timely analysis.
• C. Submit samples without documentation.
• D. Dispose of samples after interview.

Answer: (B)

Maintaining the integrity of DNA evidence rests on two foundations: proper preservation and a clear, unbroken record of handling, with labs involved promptly to preserve the viability of the sample. Preserving DNA samples means using secure packaging, appropriate storage conditions, and careful handling to minimize contamination and degradation. A complete chain of custody provides a traceable history of every person who has touched the evidence, with dates, times, and signatures, ensuring the evidence can be validated and remains admissible in court. Coordinating with the laboratory for timely analysis ensures the right tests are performed using validated methods and that the evidence is processed efficiently, reducing delays that could compromise the DNA profile.

Exposing samples to heat or light can degrade DNA, weakening or altering the profile. Submitting samples without documentation breaks the chain of custody and jeopardizes authenticity and admissibility. Disposing of samples after the interview eliminates any possibility for future testing or verification.