ust a question, does your Co. perform random UA's on site? Some do but most will give you 24-48 hours to report to a facility such as quest diagnostics. That could help with your warming up problem.
how would that be a random drug test if they give your 24-48 hours to take it......in my opinion i think a random would be like "One morning i go in and BAM! lets take a ride up to quest diagnostics!" and then i have to think fast and find away to microwave my qf with out being caught..i think i'm gonna go with the tortilla idea...they cant keep me from eating something before my test

and no they don't do UA's on site they make you go to the lab