U.S. Border Patrol has become more aggressive

The NY Times reports that borders controls have toughened considerably in the next few months.
Excerpts from the article:
All along the border, there are signs that the measures the Border Patrol and other federal agencies have taken over the last year, from erecting new barriers to posting 6,000 National Guardsmen as armed sentinels, are beginning to slow the flow of illegal immigrants.
The only available barometer of the decline is how many migrants are caught. In the last four months, the number has dropped 27 percent compared with the same period last year, the biggest drop since a crackdown immediately after 9/11. In two sections around Yuma and near Del Rio, Tex., the numbers have fallen by nearly two-thirds, Homeland Security officials say.
Border Patrol commanders say they see no explanation for the drop-off across the entire 2,000-mile border other than stiffer enforcement deterring migrants. The slackening flow, they argue, belies the conventional wisdom that it is impossible to stem illegal migration. Many veteran officers in the force are now beginning to believe it can be controlled with enough resources.
The new measures range from simply putting more officers out on patrol to erecting stadium lights, secondary fences and barriers of thick steel poles to stop smugglers from racing across the desert in all-wheel-drive trucks. The Border Patrol has deployed hundreds of new guards to watch rivers, monitor surveillance cameras and guard fences.
And zero tolerance by U.S. Courts, with jail sentences being handed out…
Though it seems cruel to many migrants, the zero-tolerance policy appears to be working, Border Patrol commanders say. Along the river the Del Rio sector patrols, arrests are a third of what they were a year ago, only about 35 a day. In the meantime, drug seizures have doubled, as more agents have been freed up to patrol.
“Word is getting around out there that if you cross in this area and get apprehended you are probably going to go to jail, and that is a deterrent,” Sector Chief Randy Hill said.