Reply #54: They should be upfront about this

[Nikia]

The companies that aren't upfront about this probably want to prevent people from using cleansing products or heaven forbid, quitting when they apply for work at the particuliar company. It puts one in an awkward spot when one isn't informed about the pre employment drug test until the end of the interview or randomn testing until one accepts the offer. There is no easy way to ask without drawing suspicion to yourself and making them less likely to hire you even if you do turn up clean.