“Is there an impact on cognitive ability or judgment?” Canadian factory workers have been talking about legally using cannabis , even if it is on their own time , writes Mike Adams in Forbes . Science has yet to catch up with industry , Adams argues , making it difficult for employers to tell the difference between workers high on the job and those who smoked marijuana the previous night . Citing these concerns , Jonathon Smith , chairman of the Canadian Association of Home Makers , has called for a zero - tolerance policy on cannabis for those who work in the construction trade , which employs around 1.7 million people .
Canadian factory workers have been talking about legally using cannabis , even if it is on their own time , writes Mike Adams in Forbes . Science has yet to catch up with industry , Adams argues , making it difficult for employers to tell the difference between workers high on the job and those who smoked marijuana the previous night . Citing these concerns , Jonathon Smith , chairman of the Canadian Association of Home Makers , has called for a zero - tolerance policy on cannabis for those who work in the construction trade , which employs around 1.7 million people .