As the result of an investigation that began in late 2007, 160 individuals have been arrested and prosecuted for crimes relating to the use of false passports and other government issued documentation. The enforcement program, initiated by U.S. Customs and Border Protection, took place at San Ysidro, Otay Mesa, and Calexico which are among the busiest ports in the United States that border with Mexico. During the beginning implementation of the enforcement initiative, approximately 20 fraudulent passports were detected each week. However, as enforcement officials became increasingly skilled at spotting fraudulent documentation, over 60 fraudulent passports per week were being detected. Immigration officials predict that the demand for fraudulent, government-issued documentation is predicted to increase due to the Western Hemisphere Travel Initiative. This program mandates that as of June, 2009 ports of entry may no longer accept a verbal affirmation of U.S. citizenship, and all travelers must produce government approved, “secure” documentation such as a passport, passport card, trusted traveler document, or an enhanced driver’s license. To help combat the obtainment and use of fraudulent documentation, enforcement and detection efforts have been employed at many border ports. A representative of the Diplomatic Security Service offers this warning to Americans: “We urge U.S. citizens who have lost or had their travel documents stolen to immediately contact the nearest U.S. embassy or consulate or the Department of State’s Bureau of Consular Affairs, in addition to local law enforcement agencies, so that authorities can place lookouts in a timely manner.”