What procedural step must be taken after collecting hair evidence?

Placing hair evidence in a plastic or glass vial and sealing it is the appropriate procedural step after collection. This method of storage is critical for several reasons: first, it helps to protect the integrity of the evidence by preventing contamination or degradation that can occur when the evidence is exposed to environmental factors. Hair samples can be delicate, and using a vial helps preserve the physical state of the sample for analysis.

Additionally, using a vial allows for better organization and easier handling during subsequent analysis or court presentation. Proper sealing of the vial also ensures that the chain of custody can be maintained, which is essential for the evidence to be admissible in court. Detailed record keeping related to the evidence, including when and where it was collected, complements the physical storage method, but is not sufficient on its own without the appropriate physical containment of the evidence.

The other options do not provide the necessary protection for hair evidence or do not comply with best practices in evidence handling and storage.