Wow, really? What in it did they say caused the false positive exactly? Also, what institution are you involved with that requires 3 tests a week?
I test my guys regularly with several of them taking Jacked and have never seen that. Only thing I can think of is the 1,3dim. and not only have I've passed repeatedly on several 1,3dim products, but so has every person I have personally come across.
Jacked = 1,3-Dimethylamylamine
Amphetamine = 1-phenylpropan-2-amine