D.o.t. physical and drug test...help!!!

These forums are great (as long as QF works). I took a test 10 days ago and used Qcarbo, drank tons of water and failed. It worked last time I used it, but I hadnt smoked in two weeks that time. This time I smoked the night before, and failed.
Does anyone know how the d.o.t. physical goes. I want to use QF (all the success stories here have sold me), but dont want to get caught with it when I drop my drawers for the turn and cough. I was thinking of having my wife sew two pairs of tighty whities together in case I have to drop my pants. I could put the QF between the two pairs to conceal it.
Thanks for any replies. I am so grateful to have found this site. Sounds like QF will make me a trucker after all.

Done shit loads of dot tests. I have always done the physical first and then you get dressed and do the UA. Put the QF with the heater in your pocket till the UA then move it to your crotch. They will have you empty all your pockets before the UA. Sometimes they take part of the sample to check for diabetes.

Thanks for the info. Just came back with the QF and did a home test with it to calm my wife down, whew. Works fine.
Should have another QF success story here on Wed.

The QF is can be tested for diabettes, right?

Yep.