Canadian trucking associations are calling for a zero-tolerance policy for marijuana use among drivers as the country prepares to legalize the drug for recreational purposes in July 2018.

The percentage of U.S. workers in “safety-sensitive” jobs — a category that includes truck drivers — who flunked their federally-mandated drug tests increased at an “alarming” rate from 2015 to 2016, according to an analysis of drug testing data collected by the nation’s largest lab. Overall, the percentage of safety-sensitive workers who failed crept up year-over-year, the report said.

A new U.S. Department of Transportation drug testing report shows that the overall 2016 lab-reported positive drug test rate for truck drivers and other DOT security-­sensitive employees rose to its highest level since at least 2009, including year-­over-­year increases in three of five drug categories.

A new U.S. Department of Transportation drug testing report shows that the overall 2016 lab-reported positive drug test rate for truck drivers and other DOT security-­sensitive employees rose to its highest level since at least 2009, including year-­over-­year increases in three of five drug categories.