A former employee of Ontario Power Generation (OPG), the Crown corporation that operates the province’s nuclear plants, has been charged with leaking "safeguarded information" that could harm Canada. 'The West Block' host Mercedes Stephenson speaks with Dan Stanton, the former executive manager at the Canadian Security Intelligence Service (CSIS), about the dangers of insider threats at highly critical institutions like nuclear power plants and the Royal Canadian Mounted Police (RCMP).