2 U.S.C. § 143c

In addition to amounts transferred pursuant to section 182b(e)(2) of this title , the Librarian of Congress may transfer amounts made available for salaries and expenses of the Library of Congress during a fiscal year to the applicable appropriations accounts of the United States Capitol Police in order to reimburse the Capitol Police for services provided in connection with a special event or program described in section 182b(a)(4) of this title .