Job applicants may be required to be screened for drug and alcohol use prior to being hired or as a contingency of a job offer. Employees may be tested for drugs or alcohol in the workplace, where permitted by state law. There are a variety of employment-related drug and alcohol tests used by employers.
The types of drug tests which show the presence of drugs or alcohol include urine drug tests, blood drug tests, hair drug tests, breath alcohol tests, saliva drug screens, and sweat drug screens. There are many variations of the screening and each test may have a different drug that they are testing for.