To amend the retirement provisions of title 5, United States Code, to extend to inspectors of the Immigration and Naturalization Service, revenue officers of the Internal Revenue Service, and certain others, the same treatment as is accorded to law enforcement officers.

Amends Federal civil service provisions relating to the Civil Service Retirement System and the Federal Employees Retirement System to expand the definition of "law enforcement officer" to include (and thus extend the applicability of such provisions to): (1) a revenue officer of the Internal Revenue Service; (2) a customs inspector of the U.S. Customs Service; (3) a customs canine enforcement officer of the U.S. Customs Service; (4) an Immigration and Naturalization Service inspector; (5) a Department of Defense police officer; (6) a Department of Defense Command Investigations Division detective; (7) a Bureau of Engraving and Printing officer; (8) a postal police officer; (9) a Secret Service special officer; (10) a Drug Enforcement Administration diversion investigator; (11) a U.S. Customs Operation Enforcement Officer; and (12) a U.S. Customs Detection System Specialist Airborne and Flight Engineer.

Prohibits applying the amendments made by this Act with respect to any period of service preceding this Act's enactment unless the employee involved (or, if applicable, an appropriate survivor) pays into the Civil Service Retirement and Disability Fund an amount equal to the total additional amounts which should have been deducted and withheld from pay (in excess of amounts actually deducted and not refunded) if such amendments had then been if effect, with interest. Requires the appropriate agency, no later than 90 days after the date on which such payment is made by an individual, to pay into the Fund any additional amounts which should have been paid by that agency into such Fund, with interest, as if this Act's amendments had been in effect during the prior periods of service involved.