For peace of mind, you can always test your 4.0 batch with a validity test strip to make sure that the creatinine, SG, pH, etc are all still okay.

You can find these test kits cheap by doing a Google search for drug adulteration test kits.

Keep in mind that expired/bad QF batches can be exchanged for current ones FOC at Spectrum Labs. Contact info can be found on the urineluck website.
Burnt Toast Reviewed by Burnt Toast on . QF 4.0 To give you a little background...I have used QF a couple times in the past and i am facing a pre-emp test at a larger local company which i have used QF for in years past when working on a contract. They will be using whatever the current top of the line standard test i assume, nothing out of the normal and they wont be watching me or anything but the company does have technology driven government contracts. The story...So i just went to the local head shop and picked up a bottle of QF. It Rating: 5