For non-unionized workers in Quebec, it is the Commission des normes, de l'équité, de la santé et de la sécurité du travail, or CNESST, formerly the Commission des normes du travail. So the investigations are conducted by people who are completely outside the company. If the prima facie evidence is sufficient, these people represent the victim and at the same time work towards conciliation.
On February 28th, 2018. See this statement in context.