(1) Nothing in this Act shall-
(a) operate to relieve any employer or worker of any duty or liability imposed upon him by any other enactment or to limit any power given to any public officer by any such enactment; or
(b) prevent any employer, worker or other person to whom this Act applies from being proceeded against according to law for any offence punishable under any law in force in Nigeria, so however that no person shall be punished twice for the same offence.
(2) Nothing in this Act shall apply to serving members of the Armed Forces of the Federation or the Nigeria Police Force.
(3) The Minister with the prior approval of the National Council of Ministers may by order exempt (subject to such conditions, if any, as he sees fit to impose) any class or classes of workers from the application of this Act or any specified provision thereof.
Section 89 of the Labour Act in Nigeria