Good, point. It is also noteworthy, that drug-tests are not as precise as people might think. Most of them look for traces of metabolic byproducts of a substan

Good, point. It is also noteworthy, that drug-tests are not as precise as people might think. Most of them look for traces of metabolic byproducts of a substance, not the substance itself. There are some (legal) medications, wich can indicate optium- and methamphetamine-addiction.