The issue of bogus batches have been addressed by the QF manufacturer, Spectrum Labs. The info is found on Spectrum Labs' urineluck website.

Also, if youre concerned over the efficacy of your batch, you can do your own validity test to make sure the creatinine, pH, S/G, etc are all with acceptable limits. Validity test kits can be found online by doing a Google search for drug adulteration test kits.