In what type of container is dried blood crusts typically placed?

Dried blood crusts are best preserved in a glass or plastic vial due to their need for protection from contamination and environmental factors. These vials provide a secure and airtight environment that helps to prevent degradation and preserve the integrity of the sample. They are also resistant to moisture and other external elements that could compromise the evidence.

In contrast, paper bags and cardboard boxes are generally not suitable for biological samples like dried blood, as they can absorb moisture, potentially leading to degradation of the sample. Using a sealed envelope may also not be ideal as it may not provide adequate protection against physical damage or contamination. The choice of a vial specifically caters to the need for preserving delicate and potentially fragile biological evidence.