I look like quasi moto anyways so no one thinks twice about my setup.
Here's what i do-
I have several people piss into a black hefty trash bag over the course of several days. Once it is filled up- about 3 gallons of piss- I cinch that fucker up and tie it up onto my back and pull a shirt over it. Bungee cables work well to get it all situated. Then I run one of them crazy straws outta that bitch and down to my fly.
Works like a charm but I'll warn ya it's kinda hard to stop it from draining once you start it.
Sounds fucking crazy I know, but I've never failed a piss test. I can let clean piss out whenever the fuck I want to, in fact I've gotten fired for screaming "anyone want to drug test my fucking piss?! I dare you cocksuckers, test me!!"
Here's a pic of me when I was screaming "you fucking pussies think my shit's dirty? Well try it, cocksuckers! Test my fucking piss you ignorant sluts!"
Needless to say I got fired that time too.