The Marihuana for Medical Purposes Regulations that became effective on April 1, 2014, could substantially increase the number of Canadians who are using lawfully prescribed medical marijuana. As the number of prescribed users increases, the greater the likelihood that an employer will have one of its employees requesting to use medical marijuana in the workplace. The purpose of this update is to review some of the workplace issues that both employers and employees need to consider regarding the use of medical marijuana in the workplace. Originally published on the Bennett Jones Thought Network and re-published in the July 2014 edition (Number 406) of Canadian Employment Safety and Health Guide by Wolters Kluwer CCH.