What is the purpose of BLUE seals on drug bags?

The correct purpose of BLUE seals on drug bags is to mark the bag as containing controlled substances. This signifies that the contents are regulated and require special handling due to potential for abuse or dependence. The use of BLUE seals helps ensure that first responders can quickly identify bags containing these critical medications, adhering to safety and legal standards related to handling controlled substances.

The other options may involve relevant topics regarding drug management, but they do not accurately pertain to the function of the BLUE seals. For instance, indicating emergency use or denoting restocking by the pharmacy do not specifically align with what BLUE seals signify in their context. Furthermore, marking expired medications is entirely different from the purpose of BLUE seals, which focus on the classification of substances rather than their shelf life or protocols concerning expiration.