The Occupational Health and Safety (OHS) Act, addresses obligations for work site parties, including workers, supervisors, and employers. While current legislation does not address impairment specifically, if impairment is identified as a hazard or creates an unsafe work situation; the employer, supervisor, workers and other work site parties have the obligation to ensure that it does not adversely affect health and safety on a work site. 

The Alberta Government has responded to questions about impairment in the workplace with an information sheet and Impairment prevention policy and procedures template.