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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Dan Cook

Dan Cook is a journalist and communications consultant based in Portland, OR. During his journalism career he has been a reporter and editor for a variety of media companies, including American Lawyer Media, BusinessWeek, Newhouse Newspapers, Knight-Ridder, Time Inc., and Reuters. He specializes in health care and insurance related coverage for BenefitsPRO.