How much of an evidence can should ideally be filled with samples?

Filling an evidence can with samples to approximately two-thirds of its capacity is ideal for several reasons related to both safety and practicality. This level allows for sufficient sample volume while still providing room for potential expansion of gases, preservation of volatile compounds, and the ability to accommodate any additional materials that may be required during investigation.

Filling the can to the top could lead to issues, such as limited air space for gas expansion or difficulty in accurately sealing the container, which increases the risk of sample contamination or degradation. Similarly, filling the can to only half or just a small amount may not provide enough evidence material for thorough analysis, limiting the effectiveness of the investigation. Therefore, maintaining a two-thirds fill strikes a balance between having a sufficient volume of evidence and ensuring proper handling and preservation of that evidence.