3 1993 warn that medications containing chloropromazine, fluspirilene, and others may yield a positive when tested for
Vicks Formula 44M containing Dextromethorphan, and
Primatene-M containing perylamine as well as the pain reliever Demerol, and prescription anti-depressant Elavil test positive for opiates up to three days. Even Quinine water can also cause a positive reading for opiates.
Poppy Seeds such as the ones on a bagel from your favorite deli, etc.