a technique used by many companies that if not stipulated in the contract is in fact illegal. however once employed you are subject to their tests. there is blood (rare), hair (pretty rare), urine (most common), spit, and other types of testing that pick up on the basic drugs. however these tests are so fuckin intense now they pretty much tell the story of your life
*Modern Day Drug Testing*
Employer: So we got your drug test back today...
Employee: Ya, everything should be good I'm clean.
Employer: Ya but it says here that you look at porn on thursdays...get out.