Just a note:

If you suspect someone is STEALING drugs, it is best to call corporate and the state. If you call the store management, you are tipping them off that you suspect, and they will stop for a while and be harder to catch.

Corporate for chain stores, has security and they have cameras and will watch the employees that way to gather evidence. They may send in "shoppers" who are paid to evaluate service as well.

I have worked in places where the management was the culprit stealing and in cahoots with others. So going around THEM is best. For errors in dispensing, that seem too frequent, I'd contact the state licensing and they will investigate your complaint. It is best to have evidence to show them. Dates and times of the fill and the error bottle and contents. Each pharmacist is licensed by the STATE, and if they lose this license from negligence, they can no longer work. The state has the most power in this kind of situation.