Incursions of border by cops, troops rising
"Unauthorized border crossings by Mexican authorities such as soldiers and police spiked more than threefold in 2008, according to an annual report the U.S. Customs and Border Protection (CBP) agency sought to keep secret.
Now that the report is public, the result of a lawsuit by a public-interest group, the agency is attempting to downplay its significance."
http://washingtontimes.com/news/2009/apr/28/incursions-of-border-by-cops-troops-rising/