New facial recognition technology has identified three immigration cheats at one of America's busiest airports - in just forty days. The trio - who travelled separately during August and September - were intercepted at Washington's Dulles International Airport, which processes more than 21 million people per year. According to a statement by U.S. Customs and Border Protection, they were each flagged-up by new software which scans minute differences between the person seeking entry and their passport photo. Impressively, mismatches are identified in as little as two seconds. Most recently, on Monday, a woman arriving on a flight from Accra, Ghana, presented a U.S. passport with a suspect image.