How do you get a high quality mold test without getting ripped off??

If the same people that do the mold tests are the same people who get rid of the mold for you, how do I know they're being honest about my situation and what is needed?

I don't smell anything musty or anything like that. I had some tiny dots of mold on the ceiling around my fart fan in one bathroom, which I think was just a ventilation problem in there. I now shower with the window open, and they haven't come back after cleaning with bleach. Though it has only been two weeks.

The home test kits aren't reliable enough. I want the best test possible, but I don't want to worry that it's bullshit. Help.