A 'mishandling indicator' for field dispensary seems like a good idea.
I think that a better approach to 'expiration dates' should be that highly controlled dispensaries (pharmacies) track lot and production dates. A given medication should have a standard expiration date based on /observed/ potency and reserving a safety factor (which should be known and recorded).
Drugs before the typical expiration date would have very infrequent random samples tested for effectiveness. If there is economic or technical incentive, medications nearing the expiration date would be tested and based on the results a new expiration date and testing schedule for the remaining units set.
I think that a better approach to 'expiration dates' should be that highly controlled dispensaries (pharmacies) track lot and production dates. A given medication should have a standard expiration date based on /observed/ potency and reserving a safety factor (which should be known and recorded).
Drugs before the typical expiration date would have very infrequent random samples tested for effectiveness. If there is economic or technical incentive, medications nearing the expiration date would be tested and based on the results a new expiration date and testing schedule for the remaining units set.