U.S. Can’t Trace Foreign Visitors on Expired Visas

From The New York Times:

Eight years after the Sept. 11 terrorist attacks and despite repeated mandates from Congress, the United States still has no reliable system for verifying that foreign visitors have left the country.

Last year alone, 2.9 million foreign visitors on temporary visas . . . checked in to the country but never officially checked out, immigration officials said. While officials say they have no way to confirm it, they suspect that several hundred thousand of them overstayed their visas.

Over all, the officials said, about 40 percent of the estimated 11 million illegal immigrants in the United States came on legal visas and overstayed.