Canada is resisting the identity card system required by U.S. law to enter our country:

Canada will not embark on an untested identity card system to meet U.S. border concerns, Prime Minister Stephen Harper said yesterday.

His government has told the Americans it prefers not to create such a card and wouldn't do so until the American government has convinced itself it is effective, Harper told reporters.

ID cards are not effective in solving the problems they are claimed to address.  Mandatory ID cards are a bad idea.