How did i test positive for barbiturates? i don't do drugs, and lost my job over this.

NSAID: Non-steroidal anti-inflammatory agents such as Ibuprofen (motrin) and naprosyn (naproxen) have been reported to have a 0.4% false positive rate for barbituates. Only you know for sure. Perhaps you would be allowed to retest. Anything else positive?

Few possibilities: There are 3 possible explanations: clerical error (you got the wrong test results), false positive (something legit like Motrin fooled the test), and true positive (you really had barbiturates). Even if you don't use drugs recreationally, some commonly prescribed meds contain barbiturates, eg, migraine meds containing butalbital.