http://www.nigeria-law.org/ConstitutionOfTheFederalRepublicOfNigeria.htm.

B - Nigeria Police Force

214. (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.

(2) Subject to the provisions of this Constitution -

(a) the Nigeria Police Force shall be organised and administered in accordance with such provisions as may be prescribed by an act of the National Assembly;

(b) the members of the Nigeria Police shall have such powers and duties as maybe conferred upon them by law;

(c) the National Assembly may make provisions for branches of the Nigeria Police Force forming part of the armed forces of the Federation or for the protection of harbours, waterways, railways and air fields.

215. (1) There shall be -

(a) an Inspector-General of Police who, subject to section 216(2) of this Constitution shall be appointed by the President on the advice of the Nigeria Police Council from among serving members of the Nigeria Police Force;

(b) a Commissioner of Police for each state of the Federation who shall be appointed by the Police Service Commission.

(2) The Nigeria Police Force shall be under the command of the Inspector-General of Police and contingents of the Nigeria Police Force stationed in a state shall, subject to the authority of the Inspector-General of Police, be under the command of the Commissioner of Police of that state.

(3) The President or such other Minister of the Government of the Federation as he may authorise in that behalf may give to the Inspector-General of Police such lawful directions with respect to the maintenance and securing of public safety and public order as he may consider necessary, and the Inspector-General of Police shall comply with those direction or cause them to be compiled with.
(4) Subject to the provisions of this section, the Governor of a state or such Commissioner of the Government state as he may authorise in that behalf, may give to the Commissioner of Police of that state such lawful directions with respect to the maintenance and securing of public safety and public order within the state as he may consider necessary, and the Commissioner of Police shall comply with those directions or cause them to be complied with:

Provided that before carrying out any such directions under the foregoing provisions of this subsection the Commissioner of Police may request that the matter be referred to the President or such minister of the Government of the Federation as may be authorised in that behalf by the President for his directions.

(5) The question whether any, and if so what, directions have been given under this section shall not be inquired into in any court.

216. (1) Subject to the provisions of this constitution, the Nigeria Police Council may, with the approval of the President and subject to such conditions as it may think fit, delegate any of the powers conferred upon it by this Constitution to any of its members or to the Inspector-General of Police or any other member of the Nigeria Police Force.

(2) Before making any appointment to the office of the Inspector-General of Police or removing him from office the President shall consult the Nigeria Police Council.

From the constitution there is a lot of confusin on who really is in Charge of the police no wonder we have this problem of bad policing.

I think Present has veto power over all without question.

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The president cannot do such he could be arrested by anyone.

Infact that would be overturning the constitution literally a coup detat