As the bill to legalize cannabis bounces around Parliament Hill, some industries want legislation to ensure the drug won’t be a danger in the workplace. “Certainly, it’s a substance that is very dangerous from the perspective of safety-sensitive positions,” Chris MacDonald, director of government relations for J.D. Irving Ltd., said Wednesday. …He’s been part of a national industry group of employers working on the issue of cannabis and the workplace. …Although the group supports legalization, it wants legislation that addresses use of cannabis by truck drivers, crane operators, people working in mills and the oil and gas sector, or in any job where impairment could create a safety risk. …MacDonald said the industry group would like to see safeguards regarding workplace safety and cannabis use, such as mandatory random testing.