Drug tests in the USA can be divided into tow general groups, federally and non-federally regulated testing. Federally regulated testing started when Ronald Reagan enacted executive order 12564, requiring all federal employees refrain from using illegal substances in specified DOT regulated occupations. Such professions as: professional drives, specified safety sensitive transportation and / or oil and gas related occupations, and certain federal employers, test them for the presence of certain drugs. These test classes were established decades ago and include five specific drug groups.
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