The thing is, when I take it in later in the day with dilute urine (nearly clear, but still yellowish), a faint line comes up (probably 20-50% intensity as that of the control) indicating I am negative.

BUT, when I take it in the morning, with concentrated, very yellow urine, the line does not come up.
The reason for this is because the dilution phenomena is only temporary - once the fluids you consume had all been urinated out, the bladder is replenished with fresh THCA-laden urine by the kidneys, and thus the donor resumes testing postive for THC.

I have heard that vitamin B2 helps make the urine appear less dilute than it is, but I do not know much about it specifically.
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Burnt Toast Reviewed by Burnt Toast on . Need some advice ! Would really appreciate it Hi all, I am new to the boards but joined to get some advice on drug testing for a job. I am 23 and have smoked nearly everyday since I was 16. I was offered a job and am really excited about it, but here's the scoop on the drug test: I have been 'clean' for about a month and a half (maybe even longer). For the past year or so, my intake has been less than it used to be. I typically roll one or two 'spliffs' a night using regular zig zags, and roughly half of it is tobacco. This is a Rating: 5