; of which $41,536,000 shall remain available until September 30, 2020, of which $6,000,000 shall be for a grant for activities related to investigations of missing and exploited children: Provided , That not to exceed $19,125 shall be for official reception and representation expenses: Provided further , That not to exceed $100,000 shall be to provide technical assistance and equipment to foreign law enforcement organizations in counterfeit investigations. Procurement, construction, and improvements For necessary expenses of the United States Secret Service for procurement, construction, and improvements, $64,816,000, to remain available until September 30, 2021. Research and development For necessary expenses of the United States Secret Service for research and development, $2,500,000, to remain available until September 30, 2020. administrative provisions 201. Section 201 of the Department of Homeland Security Appropriations Act, 2018 (division F of Public Law 115–141 ), related to overtime compensation limitations, shall apply with respect to funds made available in this Act in the same manner as such section applied to funds made available in that Act, except that fiscal year 2019 shall be substituted for fiscal year 2018 . 202. Funding made available under the heading U.S. Customs and Border Protection—Operations and Support and U.S. Customs and Border Protection—Procurement, Construction, and Improvements shall be available for customs expenses when necessary to maintain operations and prevent adverse personnel actions in Puerto Rico in addition to funding provided by 48 U.S.C. 740 . 203. As authorized by section 601(b) of the United States-Colombia Trade Promotion Agreement Implementation Act ( Public Law 112–42 ), fees collected from passengers arriving from Canada, Mexico, or an adjacent island pursuant to section 13031(a)(5) of the Consolidated Omnibus Budget Reconciliation Act of 1985 ( 19 U.S.C. 58c(a)(5) ) shall be available until expended. 204. For an additional amount for U.S. Customs and Border