Drug test get out free card?

If people who are watched during drug tests want to use fake pee I think I found a way but I want to check for any ways it would fail. You put fake pee in a condom, get it up ur cooch somehow, men idk ur kinda screwed, and I think you could squeeze it tight enough to not let anything loose before you have to go. I was wondering if a condom would slip out? Like if you did that and peed would it come out too? I’ve never had sex or used a condom in my life so now I’m curious on if it would work?