When packaging items that may contain DNA, which of the following is NOT recommended?

Using plastic bags for dry evidence is not recommended when packaging items that may contain DNA because plastic can trap moisture, which creates an environment conducive to the growth of mold and bacteria. These conditions can degrade the DNA and compromise its integrity, making it less usable for forensic analysis.

Paper containers, such as bags and envelopes, are preferred for dry evidence as they allow for some airflow, minimizing moisture accumulation and thus preserving DNA quality. Additionally, maintaining a sterile environment and reducing potential contaminants through practices like minimizing talking and sneezing contributes to the preservation of evidence integrity. Cardboard boxes can be useful for transporting evidence, but they serve a different purpose in terms of ease of transport and protection rather than preservation of sensitive biological materials.

In essence, proper packaging techniques are crucial in forensic science to ensure that any DNA evidence collected remains viable for analysis, which is why the use of appropriate materials is paramount.