Are the provisions of chapter XI of the Act respecting Occupational Health and Safety, pertaining to construction sites and principal contractors, constitutionally applicable to federal undertakings? Such is the question that the Superior Court of Quebec has responded to in Commission des normes, de l’équité, de la santé et de la sécurité du travail c. Commission des lésions professionnelles, 2016 QCCS 2424.