How should evidence collected in liquid form be preserved?

The preservation of evidence collected in liquid form requires careful handling to maintain the integrity and viability of the sample for analysis and legal proceedings. Storing it in a secure, waterproof container is essential to prevent contamination, evaporation, or spillage, which could compromise the evidence. The waterproof feature ensures that external contaminants do not mix with the sample, and the secure closure prevents any leakage.

Appropriate labeling is also critical in this context, as it provides vital information about the evidence, including the type of substance, location, date and time of collection, and the collector's details. This level of detail is necessary for maintaining a clear chain of custody and ensuring that the evidence can be accurately referenced and utilized in investigations or court proceedings.

Other methods of preserving liquid evidence, such as air-drying, using standard envelopes, or leaving the sample at room temperature in an open container, do not adequately protect the evidence and could lead to degradation or contamination, ultimately undermining its value in the investigative process.