How should samples of controlled substances be packaged for collection?

Packaging samples of controlled substances in sealed paper containers is the appropriate practice because it helps preserve the integrity of the evidence. Paper allows for proper ventilation, minimizing moisture buildup that can lead to the degradation of certain substances. It prevents contamination and interaction with the material, which can occur with plastic or airtight containers that may trap moisture or chemicals.

Using sealed paper containers also supports the chain of custody requirements, ensuring that evidence remains untainted and can be properly identified and verified in court. This method is widely accepted in forensic protocols to maintain the quality and reliability of evidence while also allowing for necessary air circulation, which is crucial for many types of substances.

Other packaging options like airtight plastic containers or glass bottles with metal caps may create conditions that are not ideal for all substances, potentially altering their properties. Loose ziplock bags are inadequate for maintaining sample integrity since they do not provide an effective seal or protection from contamination or degradation.