Final answer:
The primary test used for determining whether an employee has abused drugs is a drug screening test, which can be done using urine, blood, hair, or saliva samples. The most common method is urine drug testing.
Step-by-step explanation:
The primary test used for determining whether an employee has abused drugs is a drug screening test. This test can be done using various methods, such as urine, blood, hair, or saliva samples. The most common and reliable method is urine drug testing, which can detect the presence of drugs or their metabolites in the urine.
For example, if an employee has been using illegal drugs, such as marijuana, cocaine, amphetamines, opioids, or benzodiazepines, these substances can be detected in the urine drug test. The test can also identify prescription drugs that have been abused or taken without a valid prescription.
The drug screening test is usually conducted as a part of an employer's drug-free workplace program or as a requirement for certain jobs, such as those in safety-sensitive positions or industries with strict regulations.