1. Short title This Act may be cited as the Security First Act . 2. Operation Stonegarden appropriations and trust fund (a) Certain appropriations There is authorized to be appropriated for each of fiscal years 2024 through 2027 $180,000,000 for the Operation Stonegarden grant program, and not less than $60,000,000 for each of fiscal years 2024 through 2027 to procure technology and equipment, including communications equipment, sensors, and drone technology. (b) Operation Stonegarden trust fund (1) Creation of trust fund There is established in the Treasury of the United States a trust fund to be known as the Operation Stonegarden Trust Fund (referred to in this section as the Trust Fund ), consisting of amounts transferred to the Trust Fund under paragraph (2). (2) Transfers to trust fund The Secretary of the Treasury shall transfer to the Trust Fund, from the general fund of the Treasury, for fiscal year 2024 and each fiscal year thereafter until 2027, an amount equivalent to the amount received into the general fund during that fiscal year attributable to unreported monetary instruments seized by U.S. Customs and Border Protection from individuals crossing the United States and Mexico border. (3) Use of trust fund Amounts in the Trust Fund shall be made available to the Secretary of Homeland Security, without further appropriation, to fund the Operation Stonegarden grant program. (4) Limitation The Secretary may only expend funds made available from the Trust Fund to carry out the activity described in paragraph (3). (5) Monetary instrument (A) In general Except as provided in subparagraph (B), a monetary instrument means— (i) coin or currency of the United States or of any other country; (ii) traveler’s checks in any form; (iii) negotiable instruments, including checks, promissory notes, and money orders in bearer form, endorsed without restriction, made out to a fictitious payee, or otherwise in such form that title thereto passes upon delivery