Interviewed at a food/water micro lab ...

So, I recently interviewed at a food & water microbiology lab, and the interviewer said several things to which I could not get an answer from him. I have a few years of biochem experience, but not micro.

b]GLP[/b]. He said he ran his lab under GLP, yet he never deals with the FDA. Wouldn't he?

FDA. The lab tests food for producers, restaurants etc by testing products, stability samples etc, and yet he claims he never deals with the FDA. Wouldn't he?

AA. He never explained what his AA spec tests for. I'm guessing it's for heavy metals in water, right?

PCR. He insinuated that PCR was used to grow bacteria, yet when I mentioned PCR for DNA amplification, he simply didn't respond.

Lab. We interviewed in a conference room off a lab-type room that connected to the main foyer by a door. When I was leaving the lab-type room, a tech was there who hadn't been there when I entered. He was accessioning samples, and when I asked him if he wanted the door (which was already open) closed, the tech said no. Should it have been closed and remained closed.