What type of evidence packaging is recommended to ensure that biological material remains dry?

Using a paper bag for packaging biological evidence is recommended to ensure that the material remains dry. Unlike plastic bags, which can trap moisture and create a damp environment, paper bags allow for airflow. This is crucial because biological material, such as blood or other bodily fluids, can decompose or develop mold if it remains moist.

By using paper, moisture can evaporate, significantly reducing the risk of contamination or degradation of the sample. Additionally, the use of paper helps preserve the integrity of the evidence, which is essential for forensic analysis and maintaining the chain of custody.

In comparison, plastic bags are not suitable for biological materials that need to stay dry. Metal containers could potentially lead to corrosion and are less practical for most types of biological evidence. While evidence boxes can offer solid protection, they may not provide the same moisture control as paper bags.