Have you ever seen the border? Miles and miles of unfenced areas and where there are fences there are holes cut in them. They have increased checks on the bridges but there's no INS agents standing out there in the desert or everywhere along the Rio Grande. Apparently the two Arabs caught here last week were caught by Mexican officials when they noticed they were trying to use the illegal Mexicans' route into the US instead of through customs where agents can check them.
That's the nice thing about having them caught in Mexico. There probably more chance they will have been made to talk. They have methods over there that can get a confession out of anyone, I really wouldn't like to be the Arab male who is picked up by the Mexican police when they apply the high voltage cattle prods.