; and (B) to increase the number of weapons and the amount of currency being seized from individuals attempting to smuggle such firearms and currency from the United States to Mexico. (3) Transnational Criminal Investigative Unit There is authorized to be appropriated to the Homeland Security Investigations, for the period of fiscal years 2024 through 2027, $2,500,000, which shall be used to pay vetted members of a Transnational Criminal Investigative Unit in Mexico a monetary stipend in accordance with section 890C(d) of the Homeland Security Act of 2022 ( 6 U.S.C. 475(d) ), as added by the Transnational Criminal Investigative Unit Stipend Act (section 7105 of Public Law 117–263 ). (b) Limitation on use of funds None of the amounts authorized to be appropriated under subsection (a) may be obligated or expended until the Secretary of State certifies and reports to Congress that the Government of Mexico is taking sustained and effective steps— (1) to increase bilateral law enforcement cooperation with the United States to counter precursor chemicals and covered synthetic drugs, including steps— (A) to identify laboratories of covered synthetic drugs and illicit production sites of those drugs; (B) to identify routes used to transit precursor chemicals and covered synthetic drugs; (C) to increase interdiction of precursor chemicals and covered synthetic drugs; (D) to share samples of seized precursor chemicals and covered synthetic drugs; and (E) to pursue prosecutions of transnational criminal organizations and illicit financing of those organizations; and (2) to increase cooperation in multilateral fora to address precursor chemicals and covered synthetic drugs, including— (A) the United Nations Commission on Narcotic Drugs; (B) the World Health Organization Expert Committee on Drug Dependence; (C) the International Narcotics Control Board; and (D) the United Nations Office on Drugs and Crime.