It shall be lawful for collecting officers to receive certified checks drawn on National and State banks and trust companies, during such time and under such regulations as the Secretary of the Treasury may prescribe, in payment for duties on imports, and all public dues, including special customs deposits. No person, however, who may be indebted to the United States on account of duties on imports who shall have tendered a certified check or checks as provisional payment for such duties or taxes, in accordance with the terms of this section, shall be released from the obligation to make ultimate payment thereof until such certified check so received has been duly paid; and if any such check so received is not duly paid by the bank on which it is drawn and so certifying the United States shall, in addition to its right to exact payment from the party originally indebted therefor, have a lien for the amount of such check upon all the assets of such bank; and such amount shall be paid out of its assets in preference to any or all other claims whatsoever against said bank, except the necessary costs and expenses of administration and the reimbursement of the United States for the amount expended in the redemption of the circulating notes of such bank.
19 U.S. Code § 198 - Certified checks; receivable for all public dues; lien for payment of
Functions of all officers of Department of the Treasury and functions of all agencies and employees of such Department transferred, with certain exceptions, to Secretary of the Treasury, with power vested in him to authorize their performance or performance of any of his functions, by any of those officers, agencies, and employees, by Reorg. Plan No. 26 of 1950, §§ 1, 2, eff. July 31, 1950, 15 F.R. 4935, 64 Stat. 1280, 1281, set out in the Appendix to Title 5, Government Organization and Employees. Collecting officers, referred to in this section, are officials of Department of the Treasury.