; (B) the Tribe does not make an election under paragraph (1) within 1 year of the date of the enactment of this Act or rescinds an election under paragraph (1)(A); or (C) the Attorney General determines that the Tribe has not substantially implemented the requirements of this Act and is not likely to become capable of doing so within a reasonable amount of time. (b) Cooperation between Tribal authorities and other jurisdictions (1) Nonduplication A Tribe subject to this Act is not required to duplicate functions under this Act which are fully carried out by another jurisdiction or jurisdictions within which the territory of the Tribe is located. (2) Cooperative agreements A Tribe and another jurisdiction within close proximity to the Tribe, may enter into a cooperative agreement to carry out the functions in this Act. 20. Registration of gun offenders entering the United States The Attorney General, in consultation with the Secretary of State and the Secretary of Homeland Security, shall establish and maintain a system for informing the relevant jurisdictions about persons entering the United States who are required to register under this Act. The Secretary of State and the Secretary of Homeland Security shall provide such information and carry out such functions as the Attorney General may direct in the operation of the system. 21. Annual report on enforcement of registration requirements Not later than July 1 of each year, the Attorney General shall submit a report to Congress, which shall include— (1) a description of the use, by the Department of Justice, of the United States Marshals Service to assist jurisdictions in locating and apprehending gun offenders who fail to comply with gun offender registration requirements, as authorized by this Act; (2) a detailed explanation of each jurisdiction’s compliance with this Act