In which scenario is shelf-life extension not permissible?

Shelf-life extension is a process that allows for the continuation of the usability of materials beyond their original expiration date under specific conditions. However, it is not permissible for items that have already expired. Once an item reaches its expiration date, it may no longer meet the necessary standards for safety, efficacy, or quality.

The rationale behind not allowing extensions for expired items stems from the potential risks involved, including health hazards or decreased performance of the item. Allowing shelf-life extension after expiration could lead to serious consequences, especially in a defense or military context where equipment and supplies must be reliable and effective.

In contrast, the other scenarios involve contexts where items still have remaining shelf life and proper conditions or documentation can justify their usability. For instance, strict testing can verify the integrity of items, controlled storage environments can maintain quality, and the absence of visible degradation also supports continued use until clearly tested or assessed.