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The addition later this year of oral-fluid drug testing for marijuana, which typically detects use only for up to 72 hours after use, could allow truck drivers to use the drug and avoid detection ...

A urine drug test can quickly detect both illegal and prescription drugs in a person’s system. Doctors, sports officials, and many employers require these tests. Signs of drug use can remain in ...

Drug testing may be required as a prerequisite for some jobs. State laws may dictate when private employers can require drug tests and how they can use the results. Job candidates for “safety ...