Versions of s. 258.1(2)(a)
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in the course of an investigation of, or in a proceeding for, an offence under any of sections 220, 221, 236 and 249 to 255, an offence under Part I of the Aeronautics Act, or an offence under the Railway Safety Act in respect of a contravention of a rule or regulation made under that Act respecting the use of alcohol or a drug; or