If Canadians require further evidence why our allies in the war against terrorism no longer trust us, they need look no further than the Maher Arar case. This is the man U.S. authorities apprehended at Kennedy airport in New York last September, alleging he was an al-Qaeda operative. Mr. Arar is a Canadian citizen, but he also is a citizen of Syria and as such under U.S. immigration law -- Canadian law has a similar provision -- was subject to deportation to either Canada or Syria. U.S. authorities chose to send him to Syria. We can only guess why. At...