Cerro Flow Products interview questions

I was interviewed by a lady who seemed like she didn't want to hire me, but I somehow got the job. I was told that I'd have to pass a drug test and background check. That wouldn't be a problem since I don't do drink or use drugs. At the end of the interview, I was taken to the conference room to have the hiring manager give me an at-home mouth swab drug test (NOT standards for any other job that I've ever had). Other than energy drinks and a men's energy supplement which contained a very large amount of methocobalamin (a Vitamin B-12). Next thing I know, I tested positive for methamphetamine (this was impossible). I had to go get a blood test from my local Dr. to prove that I have never used this a day in my life. Either way, got the job, but the interview was somewhat unprofessional as most places send you to a medical provider for a drug test (UA or hair test - which I would have passed).