Which method should not be used when sealing evidence containers?

When sealing evidence containers, it is crucial to maintain the integrity of the evidence and prevent tampering or contamination. The use of staples is not recommended for sealing evidence containers because they can easily be removed or damaged, compromising the evidence's security. Staples may also create holes or tears in the material, which can lead to exposure to the environment, potentially altering or damaging the contents.

In contrast, heat sealing provides a robust seal that is tamper-evident, meaning any attempt to open the container can be easily detected. Using string can effectively bind and secure containers, while adhesive stickers can provide a reliable closure that also signifies when a container has been opened. These alternatives ensure that the evidence remains intact and clearly indicates whether it has been compromised, which is essential for maintaining the chain of custody.