text: U.S. expert says Canadians should know missile defence won't work (Canadian Press) Canadian Press - OTTAWA (CP) - Washington is putting subtle, but real pressure on Canada to join a proposed missile defence system that won't work anyway, an American scientist says. Ted Postol, a physicist from the Massachusetts Institute of Technology, says U.S. authorities warn that Canada will lose its say in continental defence if it takes a pass on the missile system.