What will you do if your employee returns from lunch smelling of marijuana? That's one of several issues companies may have to deal with once the federal government legalizes the use of cannabis later this year.

What is it about legalized marijuana that differs - or not - from other substances, such as alcohol, which are already prohibited from use at work?

A survey by the Human Resources Professional Association released in January found that 71 per cent of HR professionals believe their workplaces are not prepared to deal with the coming legalization of recreational marijuana, including issues related to impairment, usage on the premises and safety.

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