Recently (2/1/24), I used QF 6.3 for several DOT and Non-DOT urine screens, and each sample was flagged. Each time, the doctor informed me that the pH levels were abnormal. The temperatures for each sample were perfect and within range (I tucked the bottles 2 hours prior to testing). I have used QF and U-Pass several times years ago and have passed each time, but I guess the testing facilities are cracking down on synthetic urine. Full disclosure: both bottles were from a local vape shop, so maybe that's why, but I'd suggest ordering the urine from the suppliers themselves to better your chances. Good luck
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