First, let me thank those memebers who disseminate CORRECT information on this and other related boards about substitution, quickfix, and urinalysis for cannabis. You are truly doing a tremendous service for the community at large. People's lives and families are at stake here (e.g feeding children). Also, thank you for identifying MISINFORMATION and even DISINFORMATION posted on this and related boards. While we remain persecuted for activities in our private lives, we must meticulously stay ahead of the "system's" game.

Let me secondarily state that I am a PhD bioscientist who has DIRECT experience developing/inventing immunoassays, am well versed in human physiology as it pertains to urine content and drug pharmacokinetics, and I am also a MMJ patient. That being said, I am apalled to see how much nonsense people state on these type of boards. From my perspective, it sounds ridiculous.

For the first time in my life, I was recently drug tested for a job (pre-employment). I didn't have time to clean out through abstinence. So I did my research and concluded substitution was the best approach and QuickFix was the way to go. I was, and am stil concerned about the rare reports of people using QF and failing. While the educated here have dispelled the validity of most of these failure claims, a few still may have merit, though I am hoping the explanation in those cases is due to product tampering/counterfeiting.

I used QF5.7, batch # ending in -09 tday. I practiced getting the temp correct like many of you recommended. Thanks. I learned that the temp. strip on the QF bottle is actually markedly inacurate (3-5°F lower) than the true temp as measured with a calibrated thermom. This worried me. After pissing in the cup though, I realized that Labcorp uses a similar style inacurate (2-4°F lower) temp strip on their cup, so its a wash in terms of getting the specimen right where u need it to be. I will report my results on this board at the end of this week. I don't have the time to dispell all the crap I have read on subbing here, but let me make one point. shrt f some miracle, I find it impossible to believe that validated labs use Quickfix to calibrate their testing equipment as I have read on the product web sites. As someone who has calibrated these type of machines before, the standards used to calibrate ALWAYS come with QA verified, QC tested, specifications. QF product does not contain a technical spec sheet in the box as is ALWAYS the case with calibration standards. Thank you all.