> Maybe air traffic controllers and similar professions need to be evidently clean. kinda obscure example. i expect most operators of heavy machinery, human tr

> Maybe air traffic controllers and similar professions need to be evidently clean. kinda obscure example. i expect most operators of heavy machinery, human transportation devices and some security professions to require some verification of abstinence. i was tested once in order to get the required permit to drive a van with elderly and disabled ppl for the red cross.