"Stopping" illegal immigration Mexican style

Perhaps the U.S. Government could learn a thing or two from the Mexican Government on how to find illegal immigrants within a country's borders. Here are the money quotes from the New York Times:

"Between January and September, the National Migration Institute, Mexico’s immigration service, deported 350 Americans, some of them lawbreakers who had finished prison sentences in the country, but others merely travelers who were found to be without proper paperwork.
One of them was the scruffy wanderer in his early 40s who goes by the name Crash, eschews regular employment and racks up stories of his adventures.
“I didn’t know you could be deported from Mexico,” he said, requesting that his full name not be used to avoid running further afoul of the law. “I didn’t know it was possible. Now I know.”
He said he had been riding in the back of a pickup truck from Huatulco, a popular vacation spot in the southern state of Oaxaca, to the resort city of Acapulco several weeks ago when the vehicle approached a checkpoint. The authorities asked Crash for his passport. He did not have one.
He said he was taken away and later found himself in a police lineup. He said he had been told that a woman had been robbed in Acapulco by a blond man with a goatee. Looking at the other men in the lineup, Crash said they could have been his brothers, all of them blond and with goatees.
He was not chosen as the robber but said he was sent to jail nonetheless, which was not an altogether unpleasant experience for Crash. “The cell was better than some of the 300-peso hotel rooms I’ve stayed in,” he said. “The only thing was that it had bars.”
He said he spent about a week there while the American Consulate prepared travel documents for him. When informed that he was going to be deported to the United States, he said he initially could not believe it. “I thought to myself, ‘You’ve got to be kidding. This is a joke. You’re deporting me from Mexico?’ "

See how easily it's done? Perhaps someone at Homeland Security would take note of this.