 [ Symptoms ] what medications can result in a false positive for illegal methamphetamine in a urine analysis who is never used before i am having bariatric surgery my labs came back pos for methamphetamine when i have never done any drugs in my 40yrs of living are there otcprescribed meds that could cause this because of the results they want me to do treatment & wait a yr before surgery which is for my severe acid refluxobesity i am mortified since i have never used illegal drugs i am on several prescriptions it has taken me 20 yrs to finally get my insur to cover this surgery just to have this happen  please help [ Disease ] a duplex ultrasound is a penile test performed by bouncing sound waves off tissue to determine penile blood flow