" (b) where the investigator believes on reasonable grounds that the medical examination of a person who is directly or indirectly involved in the operation of an aircraft, a ship, a rolling stock, a pipeline or a truck is, or may be, relevant to the investigation, by notice in writing signed by the investigator, require the person to submit to a medical examination; ," and
«b) obliger toute personne participant, directement ou non, à l'exploitation d'un aéronef, d'un navire, de matériel roulant, d'un camion ou d'un pipeline à subir un examen médical si, à son avis, celui-ci est utile à son enquête ou susceptible de l'être; »;