Do those potions and drinks I see for sale work to beat a simple piss test? I developed myself a pretty bad oxycontin habit after being in the hospital a couple years ago with a morphine pump . I finally quit using suboxone but they piss test me every time I go to re-up my script. I want to still be able to smoke weed. The piss test seems pretty simple, just a cup that shows instant results, it does not go to any kind of lab. Can anything beat this test?