A saliva-based drug test is similar. It involves swabbing the inside of your cheek and inserting the swab into a test collection device or placing the saliva sample directly onto a special test strip.

For example, United States federal law mandates that people working in the transportation industry take regular drug tests. Laws about employee drug testing differ geographically. A person should ...

More employers are quietly taking what once would have been a radical step: Dropping marijuana from the drug tests they require of prospective employees. (John Locher/AP) Analysis by Jena McGregor ...

Second, drug testing is not an effective means for screening out employees whose on-the-job performance is being impaired by drugs. The results of drug testing only indicate that traces of a drug are ...

Mouth swab drug tests are becoming increasingly common. Here's what you need to know about them. ... The sample is analyzed for traces of substances, either on-site or in a lab.