Health Canada estimates that by 2024, 450,000 Canadians will be authorized to use medically-prescribed marijuana. Employers may face potential legal challenges from employees who say that law allows them to use marijuana away from the workplace. A review of decisions addressing dismissal for workplace usage or possession of marijuana shows an inconsistent treatment to the issue, which is early stages in terms of the law. Issues include an employee’s failure to disclose their medically–prescribed marijuana intake and violations of policies that are not yet fully established. Until decisions are made, employers should take the opportunity to review their policies and procedures relating to drugs, alcohol, and accommodation.