Hey. First time poster. I have an employment drug test in 2 days. I took the test on Friday following N2's advice, thank you very much, but my test was a failed diluted and I have to retake. I'm gong to follow N2's substitution method (hopefully I wont be getting observed). I have a 1.7oz shampoo bottle, is that a large enough amount? The test is with labcorp but I can't find any info to answer this question.