I'm not a lawyer, but you mentioned natural justice: a person has the right to know. I would think that a lot of times it would be a department or their acts being investigated, and maybe not a person. I don't think such natural justice would apply to a department. We saw in the Lac-Mégantic disaster that Transport Canada wilfully, systematically overlooked safety procedures. That wasn't Bill Smith doing it; it was the whole department. It would seem counterintuitive to protect natural justice—
On February 14th, 2017. See this statement in context.