DETROIT - JANUARY 31: A driver hands her driver's license and birth certificate as proof of citizenship to a U.S. Customs & Border Protection agent at the Detroit/Windsor Tunnel January 31, 2008 in Detroit, Michigan. Today is the first day that new rules for identification documents went into effect at U.S. borders. Travelers will need to present proof of citizenship such as a U.S. passport or birth certificate. A drivers licence and oral declaration of citizenship will no longer be sufficient.