knowing that such substance would be unlawfully imported into the United States from a place outside of the United States shall be used for security measures along the international border between the United States and Mexico, including the construction, installation, deployment, operation, and maintenance of physical barriers, tactical infrastructure, and technology in the vicinity of such border, for the purpose of stemming the flow of illegal narcotics into the United States and furthering the security of the United States. 5. Reservation of portion of forfeits in the Department of Treasury Forfeiture Fund for building a physical barrier or advanced technology to prevent illegal entry across the southern border Section 9705 of title 31, United States Code, is amended— (1) in subsection (a)(1), by adding at the end the following: (K) Payments for border security enhancements.