Quote Originally Posted by dudeseriously
Hi all,

So alittle background on me. I'm 27 yrs old 6' and about 170lbs. I've been a daily smoker for the last 5 years. About 2 weeks ago I was called in for an interview and I knew they would drug test me so I stopped smoking. The interview process took a week and they're just waiting on my background before they send me in to do my drug test (UA at Concentra Urgent Care). I started the Stinger 7 day Detox and finished the regiment last friday. I wanted to check the results so I bought an at home drug test from walgreens and I passed. Since I'm a paranoid person I wanted to double check my results with one of those cheap test strips you can pick up at any head shop. I failed that one. I haven't been exposed to pot smoke in 14 days now so I don't know why I'd pass the walgreens one and not the one from the head shop. I already own a bottle of quickfix, but since I've been clean for 2 weeks I'd prefer to pass the test legit. I'm going in to pee either tomorrow or thursday.

Has anyone ever had this happen, where they'd pass a test and then a day later fail one? What would cause this?
You can pass a piss test one day and fail another without dilluting one test and not another etc. Levels of THC-COOH fluctuate in your body daily as shown in these studies in an article by NORML. Marijuana Drug Test Detection Times | California NORML

Also, Burnt Toast, I see you always stating that Immunoassay GC/MS test for different metabolites, and if you can pass an immunoassay, you can pass a GC/MS. From the research ive done on this i've came up with different. That both tests test for the same metabolite (THC-COOH) and the GC/MS is a more sensitive test. I'd like to know how you figure your conclusion about these two tests.