Health Canada’s restrictive approach to marijuana safety testing is putting the public at risk, a growing chorus of scientists and activists warns – saying consumers are potentially being exposed to contamination in products that are widely accessible since the federal Liberals took power promising legalization. A number of laboratories accredited by Health Canada say the regulator has repeatedly discouraged them from analyzing any cannabis that does not come directly from one of the country’s 31 licensed medical marijuana producers. (Medical marijuana: Does research back up claims of therapeutic benefits?)