i also have to take the D.O.T. test atleast yearly. once i wrote on the paperwork i was taking hydro and they would not approve my results. i had to give them script #, pharmacy, dr's. name etc... i dont know if they check the info or not. the next time i did not write it down and nothing happened. so dont admit to it unless they ask for you for reason why youre positive result shows up. most tests are only nonprescription drugs, coke, pot, etc....