I am a logistics manager for a trucking company but do not drive. It's a small company where for the 2 years that I have been there, no office personel have been tested. We do randoms on our drivers, so you could consider this a DOT job. The owner started testing office personel for insurance reasons. The woman at the testing site asked all of our staff for our phone numbers after the samples were given where we could be contacted and I have not had a call back. I'm just hoping the QF is as reliable as you and everyone else says. Do you think I'm in the clear? Have you heard of anyone who "failed" a test using QF? Can this stuff show up on the test as being an "Altered" sample?