Whaddya know?:

The turn of events here in the busiest illegal-immigration corridor on the border — where more than 1 million migrants have entered in recent years — is among the most dramatic examples of how tougher border enforcement is disrupting the flow of migrants. Previous crackdowns have served only to shift illegal crossings to new areas, but so far this year there are no signs that the border has sprung another leak. Apprehensions have decreased in every area along the Southwest border, in some places by more than two-thirds.

Now if we can just keep Ted Kennedy and John McCain from sabotaging this effort with their guestworker/amnesty program, we might start to see some progress.