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 percent of tests in 2013 to 4.7 percent 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.