I'll just add to that. Any piece of investigative journalism is built on a mountain of information, which includes documents and other kinds of source material in addition to people. With a touchy investigation, we do more than double-source. We have multiple people around anything that is at that level. I mentioned the RCMP investigation that we did. We had multiple sources, and we tested their credibility.
On June 19th, 2017. See this statement in context.