Pre-employment drug testing
This is by far the most common type of drug test used by businesses, however, it is also the least effective. It is considered to be an “intelligence test” by drug testing professionals. It has the advantage of being inexpensive, since only one test per employee needs to be paid for by the [...]

Drug tests in the United States can be divided into two general groups, federal mandated and general workplace. Federal mandated drug testing started when President Ronald Reagan enacted via executive order, that federal workers refrain from using illegal substances. Subsequent federal legislation required drug testing within the executive branch of government as well as “safety [...]