Establishment of Nigeria Police Force
Section 214(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) There shall be a police force for Nigeria, which shall be known as the Nigeria Police Force, and subject to the provisions of this section no other police force shall be established for the Federation or any part thereof.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 95–96. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections