29 U.S.C. § 5107
RULES OF CONSTRUCTION.
“Nothing in this Act shall be construed—“(1) to in any way diminish the rights or benefits that an employee is entitled to under any—“(A) other Federal, State, or local law;“(B) collective bargaining agreement; or“(C) existing employer policy; or“(2) to require financial or other reimbursement to an employee from an employer upon the employee’s termination, resignation, retirement, or other separation from employment for paid sick time under this Act that has not been used by such employee.