It isn't just Canadian authorities that make me wonder.

Border security scrutinized after TB patient slips in

http://www.cnn.com/2007/HEALTH/conditions/05/31/tb.flight/

Man With Bloody Chain Saw Allowed to Enter U.S.<img src="/ubbthreads/images/graemlins/ooo.gif" alt="" /> <img src="/ubbthreads/images/graemlins/shocked.gif" alt="" /> <img src="/ubbthreads/images/graemlins/ooo.gif" alt="" /> <img src="/ubbthreads/images/graemlins/shocked.gif" alt="" /> <img src="/ubbthreads/images/graemlins/sad.gif" alt="" />

http://www.washingtontimes.com/news/2005/jun/08/20050608-122827-2141r/

http://www.thenoiseboard.com/index.php?showtopic=83517