; and (B) may work in coordination with State and locally implemented public and private take-back programs. (4) From time to time, beginning in the second calendar year that begins after the date of enactment of this subsection, the Secretary of the Treasury shall transfer from the general fund of the Treasury an amount equal to one-half of the total amount of taxes collected under section 4192 of the Internal Revenue Code of 1986 to the Attorney General to carry out this subsection. Amounts transferred under this subparagraph shall remain available until expended. . (b) Funding of substance abuse programs From time to time, beginning in the second calendar year that begins after the date of enactment of this Act, the Secretary of the Treasury shall transfer from the general fund of the Treasury an amount equal to one-half of the total amount of taxes collected under section 4192 of the Internal Revenue Code of 1986, as added by this Act, to the Director of the Center for Substance Abuse Treatment of the Substance Abuse and Mental Health Services Administration for programs of the Center, including the Block Grants for Prevention and Treatment of Substance Abuse program under subpart II of part B of title XIX of the Public Health Service Act ( 42 U.S.C. 300x–21 et seq.) and Programs of Regional and National Significance. Amounts transferred under this subsection shall remain available until expended. 13. GAO study Not later than 1 year after the date of enactment of this Act, the Comptroller General of the United States shall— (1) conduct a study examining the coverage offered under commercial health insurance plans and reimbursement rates under the Medicare program and State Medicaid plans with respect to— (A) substance use disorder treatment services, as compared to other health services, and how any disparity identified under this paragraph may contribute to differences in salary and turnover among substance abuse disorder providers