I've never posted before, but I felt compelled to offer you some advice.
I was in a similar situation like you, at an independent that was shady, didn't like the way the owner ran things and I was mostly there legally while the tech ran the show. Like you, I didn't want to quit so soon, but I had my breaking point and realized I had to get out, so I quit a few months in.
I agree that the grass isn't always greener, but I would suggest staying there if you can bear it for a few more weeks, while looking for a new job at a chain pharmacy, i.e. CVS, Walgreens, etc. It'll be easier to get a new job while you're still employed. Many independents are shady from what I hear, selling things without Rx's etc. But, you'll get shady customers at chain pharmacies as well. However, the pharmacy will require you to be more strict regarding the law.
Also, definitely make sure you have malpractice insurance. You should be careful, what's to stop the owner from throwing you under the bus if the pharmacy gets caught for doing something shady? If the customers who go there are shady, what does that tell you about the pharmacy? Unless it has something to do with where the pharmacy is located.
And don't feel bad about quitting, it'll be easy for the owner to find another pharmacist. And it doesn't sound like he invested too much in you if the tech runs the show and you are just there to satisfy the legal requirement. Just be polite about quitting and if they ask, just say it wasn't a good fit.