2008 SCC 28 - The Supreme Court of Canada blows out Canada's national-security state - (9-0)

"The principles of international law and comity of nations, which normally require that Canadian officials operating abroad comply with local law and which might otherwise preclude application of the Charter to Canadian officials acting abroad, do not extend to participation in processes that violate Canada’s binding international human rights obligations. "

--unamimous judgement from The Supreme Court of Canada

Other details at the Globe and Mail website.