The Department of Homeland Security (DHS) is required by statute to develop and implement a biometric entry-exit data system.  To facilitate the implementation of a seamless biometric entry-exit system that uses facial recognition, and to help identify persons attempting to fraudulently use U.S. travel documents and other criminals or known or suspected terrorists, DHS is proposing to amend the regulations to provide that U.S. citizens may be required to provide photographs upon entering or departing the United States.