U.S. Doesn’t Know How Many Foreign Visitors Overstay Visas

BEIJING, CHINA - JUNE 17: (CHINA OUT) A U.S. visa is shown by a tourist as the first group of Chinese tourists set out to visit US at the Beijing Capital International Airport on June 17, 2008 in Beijing, China. An initial group of more than 200 tourists has flown from the cities of Beijing, Shanghai and Guangzhou for a 12-day visit to the U.S. under a memorandum of understanding (MOU) last December that allows Chinese tourist groups to travel in the U.S. The agreement has considerably eased the way by conferring China's "approved destination status" on the country. (Photo by China Photos/Getty Images)