A blood drug test may be used when job applicants or employees are screened for illegal drugs. A blood test measures alcohol or drugs in the blood at the time the blood is drawn.
Blood tests are not used as frequently as urine drug tests, because, unlike urinalysis, a blood test does not measure drug residues that remain in the body after the effects of the drug have worn off.
Drugs that are screened for in a typical blood test for employment purposes include amphetamines, cocaine, marijuana, methamphetamines, opiates, nicotine, and alcohol.
Blood tests may be required as part of pre-employment screening or may be conducted randomly by employers, especially for employees in certain occupations, or may be required after an on-the-job accident or injury. A blood test is the only way to determine legal intoxication.
Drug and Alcohol Tests
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