DALLAS 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. New concern was focused on that security loophole last week, when Hosam Maher Husein Smadi, a 19-year-old Jordanian who had overstayed his tourist visa, was accused in court of plotting to blow up a Dallas skyscraper.
Last year alone, 2.9 million foreign visitors on temporary visas like Mr. Smadis 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.
Mr. Smadis case has brought renewed calls from both parties in Congress for Department of Homeland Security officials to complete a universal electronic exit monitoring system.
Representative Lamar Smith of Texas, the senior Republican on the House Judiciary Committee, said the Smadi case points to a real need for an entry and exit system if we are serious about reducing illegal immigration.
Senator Charles E. Schumer, Democrat of New York and chairman of the Judiciary Committees subcommittee on immigration, said he would try to steer money from the economic stimulus program to build an exit monitoring system.
Since the Sept. 11 attacks, immigration authorities, with more than $1 billion from Congress, have greatly improved and expanded their systems to monitor foreigners when they arrive. But despite several Congressional authorizations, there are no biometric inspections or a systematic follow-up to confirm that foreign visitors have departed.
