When I went to get a UA for my job they gave me the UA before the physical. When I asked why the collector told me it was because if I failed the UA then the company would not have to pay for the physical. lol
I stopped smoking 3 weeks prior and flushed before the UA and when I gave her the cup she put a small strip in it that had four lines on it. They tested for all kinds of drugs. The THC section gave a faint line so they sent it off to the lab. But it came back ok and I got the Job. I am now working in Quality Control at a major manufacturing plant.