Members of the Canadian aviation industry are forbidden from consuming cannabis for at least 28 days before going on duty, according to new rules now in force.

Canadian Aviation Regulations require that pilots, cabin crew, and air traffic controllers must have a certain level of "fitness for duty" on the job, Transport Canada said Thursday.

That means they cannot use or be "under the influence of any drug that impairs the person's faculties to the extent that aviation safety is affected," the agency said.

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CBC News ~