The number of illegal drug users on the job is increasing. And while marijuana continues to be the most commonly identified illegal drug in workplace tests, there's a rising incidence of cocaine and methamphetamine use as well.
The news comes from a study of workplace drug testing results by Quest Diagnostics. More than 10 million test results were analyzed. In general, Quest said, drug use on the job is increasing again after a period of stability or decline, depending upon the drug.
Quest said the study found that positive drug tests increased from 4.3% of tests in 2013 to 4.7% in 2014, thus making last year the second year that drug tests showed an increase in use of illegal substances.
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