I have a question for anyone who might have the answer, also I don't think it's worth starting a new thread for it. After extensive web and board searching, I haven't found anything that I think answers my question.

What sort of tests would a lab do to determine urine validity other than specific gravity, creatinine levels, and pH?

The reason I ask, is since I had a problem with using QuickFix 5.7-1, that it didn't immediately come back with a negative result, do I have a chance of them performing more extensive tests and finding out that it was substituted?

A canceled or generally invalid result due to unknown interference is WAY better than having a substituted result. Such that the former would likely grant me a retest, and the latter simply will not.

I'm not sure what more tests they could perform though, beyond smelling it, but it's the canadian version of quickfix and thereby even contains uric acid. Also after reading the DOT guidelines, it never 'limits' the maximum amount of testing that can be done, it only sets the minimum for the tests that must be performed.