On probation and failed a drug test for amphetamines. I have been free of drugs since Dec of 2016, but I have recently been taking Stacker 3 XPLC. Could this be what caused me fail for amphetamines? Although they no longer contain ephedra. ## I would like to know if Stacker 3 or Vapo Inhalers can cause false positives in urine drug tests for methanthetamines? I tested positive at my last 2 Dr appointments. I’ve never tried ANY kind of drug. The only things I take on regular basis are both Stacker 2 & 3, Sudafed, and I use Vapo Inhalers a lot due to my sinus problems. ## I'm assuming so since I've had the same issue..it looks like someone above also has. ## Sudafed may cause your results to show positive when you submit lab work. The person giving you the test should as...