The American ambassador to Canada warned Nov. 12 that Canada's move toward decriminalizing small amounts of marijuana would worsen congestion problems at the U.S. border, according to Canadian news sources.

Ambassador Paul Cellucci said the bill would give the impression pot was easier to obtain in Canada, which would put U.S. Customs officers on special alert for smugglers.

The increased inspection and questioning of certain people coming into the United States would slow up crossing points already bogged down with security-related screening, he said during a meeting with the National Post's editorial board.

"Why, when we're trying to take pressure off the border, would Canada pass a law that would put pressure on the border?" he asked.