It is hard to say at this point what law enforcement might or might not believe but do you have any reason to believe you are a suspect? Have you been contacted by investigators at all? Because you obviously have some concerns about potential culpability, I would consult with an attorney immediately and not discuss this case with anyone else. An hour with an attorney who can advise you is money well- spent.
Do not wait until you are charged to protect yourself. Hire an attorney now to do the investigation into your situation. The attorney is a barrier to the government obtaining evidence that can be used against you. Also, if you are working in a pharmacy I suspect you have some level of license to do so. I am currently defending an action to revoke the license of someone who is alleged to have been involved in theft of drugs. The investigation can lead to unexpected consequences in other areas.
I am not offering legal advice and in no way does this post create an attorney-client relationship.