How much space should be filled in an evidence can when collecting samples?

When collecting samples in an evidence can, it is important to leave some space, which is why filling the can to two-thirds is recommended. This allows for proper mixing and analysis of the contents without risking contamination or degradation of the sample. If the can were to be filled to the top, there would be no room for air movement, which is essential during the storage and transport stages. Leaving too little space could compromise the integrity of the sample and makes it harder to analyze accurately later on.

Filling it one-half or one-third might not provide sufficient volume for effective handling and analysis either. The two-thirds fill level strikes a balance, ensuring that there is enough material for testing while also allowing for safe storage and transport conditions.