With typical immunoassay you'd expect about 2/3rd of results to be false positives, depending on how much ephedra you consumed and your general urine pH and hydration levels.
I?ve usually doses earlier in the day, but last night I dosed later. Would 6 hours make a difference between a positive and negative test or does metabolization take a long time and those 6 hours not matter either way? I?ve heard 1-2 days
If the test is a crappy one, yeah. Most drug tests from dipsticks and panels have to be sent in for lab confirmation, anyway. In my home state, that's the law.