Forensics Crime Scene Practice Test 2026 – Comprehensive Exam Prep

Moisture control is key to preserving DNA evidence. DNA is vulnerable to degradation in the presence of moisture, heat, and microbial activity. Packaging that traps moisture creates a humid, warm microenvironment where enzymes and organisms can break down DNA, or contaminate the sample. That’s why moisture-retaining plastic should be avoided. Paper packaging, on the other hand, is breathable and helps moisture escape, reducing the risk of hydrolytic damage and microbial growth. The color of the packaging and the idea that paper is never used aren’t the factors here, and in practice paper packaging is indeed commonly used for DNA evidence.