45.3. In any proceeding against a consumer of coloured fuel oil, it is not necessary, in order to justify a condemnation, to prove that coloured fuel oil was acquired and used in contravention of this Act; it suffices to prove that the tank used to supply the engine of a motor vehicle, aircraft or boat contained, in contravention of this Act, coloured fuel oil on the very day of the examination, audit or inspection provided for in sections 38 and 39.