A brief discussion of pre-employment drug testing. Discusses the law on when a drug dependency is required to be accommodated, the justification for drug testing, and the workplace health and safety plans to support testing. It discusses when pre-employment, pre-access, random drug testing and zero tolerance policies are discriminatory. It discusses the implications of medical cannabis and recreational use. Discusses a decision where the lack of cannabis testing that could determine impairment was found to be undue hardship.