Yeah I actually have some clean piss in the fridge, but with random testing they could just tell you to go test right from work, then I'd be screwed.
I have to small bottles with thermometers and nozzles on them (QuickFix bottles) that I had a relative put piss in for me. I wear my jock strap and put them in the pocket
where the cup goes. You can't tell I have them and they'd have to grab my junk to find them.
But I don't want to have to wear that everyday. Plus getting fresh piss alot wouldn't be easy. Not sure how long piss stays good if you refrigerate, then warm it up, then refrigerate again, then warm it up, etc...