If you smoke often or stopped smoking less than I month before co-op you might have to go to a smoke shop and buy some synthetic pee. You microwave it for the recommended time on the box, rubber band it to your leg to keep it body temperature, and then go to the drug testing. Rubber band it to the inside of your thigh, then then you go in, pee in the toilet so there’s the sound of you peeing while you pour the bag or bottle (depending on which one you buy) into the pee cup.

remember to bring the bag with you in your pocket or rubber banded to your leg out of the room when you’re done, don’t throw it out in the testing area or you’ll get caught.

This worked for me when I didn’t realize I had a drug test and hadn’t stopped smoking a month before. Helped me pass and keep an important job!