When the TSB investigates an accident, no other federal department except DND and the RCMP may investigate for the purpose of making findings as to the causes that contributed to the accident. If one of these agencies investigates an accident, does that put the TSB on the sidelines? Who leads the investigation? Do the RCMP and DND have the expertise to investigate that the TSB has?
On May 16th, 2016. See this statement in context.