My friend had a Urine test for united and said that he was watched, often times Ua's will be supervised. He worked out like there was no tomorrow drank plenty of water and was clean for exactly 14 days. He smoked heavily every day up until 14 days before his test, he smoked good quality regular type weed, it wasn't the highest of grades(kindbud/chronic), but it wasn't the worst either. He passed his test. Hope this helps good luck. I've got a test tomorrow I hope I pass.