Has anyone ever had any luck with the substitution method to pass a drug test? Good experiences? Bad experiences? I need to know because I am going in to take a test today at a hospital and I'm going to try to use my friend's piss. Can anyone give advice?

Not posting this in drug testing thread because I need it answered soon.

Youll be fine, you dont have to pee in front of anyone. just make sure you keep it warm.

From the ones I've seen, put a thermometer on the bottle. Strap it to you, and make sure you keep the piss fresh.

Do what I did, put the piss in some clean bottle like a aspirin one. Get those pads that warm when you attach them to a injured muscle. Wrap pad around piss bottle. Sew a secret pocket in your pants, near your dick. It's worked for me every time, except for when my little sisters piss tested dirty for weed.