Lack of clear evidence on impairment from cannabis use has led to vastly different workplace policies. Police officers in Ottawa and Vancouver face no restrictions on their off-work use of cannabis as long as they are fit for duty, officers in Calgary have been banned from use and in Toronto they face a 28-day abstinence period. (Shutterstock)

Cannabis in the workplace: We need an accurate measure of impairment

Will offices, construction sites and medical clinics become less safe now that marijuana is legal in Canada? Our experts review the evidence, or lack of it.

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