Having a son that is a pharmacy manager has taught me how many people go into pharmacies that are absolute assholes and you cannot trust the public. Want to guess how many come in trying the "you shorted me on my pain pills"? His license is on the line with everything that goes on in his pharmacy and I guarantee you there is no tech messing with scripts on his watch. Once he had been out for shoulder surgery and when he went back he was auditing prescriptions and found one that was suspicious. Turns out a tech had faked a script for her ex-husband for painkillers. Once my son found it, he turned it over to the authorities and the last I heard, she was serving time.
He gets people coming in with fake prescriptions, people trying to get pain meds filled early, etc., etc., and he refuses them. They get irate and some have threatened him.