; (2) by amending subsection (c) to read as follows: (c) Federal share (1) In general Except as provided in paragraph (2), the Federal share of the cost of any activities funded by a grant under this section may not exceed 50 percent. (2) Waiver If the Attorney General determines that a territory (American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, or the Virgin Islands of the United States) or an Indian tribe is unable to comply with the requirement under paragraph (1), the Attorney General shall waive such requirement. ; and (3) in subsection (d), by inserting before the period at the end the following: , including territories of the United States . 5. Government Accountability Office report (a) In general Not later than 5 years after the date of the enactment of this Act, the Comptroller General shall conduct a study assessing— (1) the implementation of the amendments made by this Act; (2) any challenges related to integrating the territories of the United States into the AMBER Alert system; (3) the readiness, education, technological, and training needs of territorial law enforcement agencies in responding to cases involving missing, abducted, or exploited children; and (4) any other related matters the Attorney General or the Secretary of Transportation determines appropriate. (b) Report required The Comptroller General shall submit a report on the findings of the study required under subsection (a) to— (1) the Committees on the Judiciary of the Senate and the House of Representatives; (2) the Committee on Environment and Public Works of the Senate; (3) the Committee on Transportation and Infrastructure of the House of Representatives; (4) the Committee on Energy and Natural Resources of the Senate; (5) the Committee on Natural Resources of the House of Representatives