well, i smoke the same way, and have for 15 years, and i think sub. is the only way. Look into a urinator or something. You really gotta do it i think. Thats a FOR SURE WAY. In all my piss tests, no on e has ever watched me pee and im a dude. I'm sure they'd give a female way more privacy.

ive gone in there with a rubber full of someones pee tucked away and even did it that way.Good Lucl