Okunola, in charge of the Federal SARS in Bayelsa, providing protection for INEC officials, voters and materials was on Feb. 24, brutally attacked and molested by thugs allegedly led by Adi.
The police officer was molested for allegedly refusing to append his signature on fake election result sheets.
The Inspector General of Police, Mr Mohammed Adamu had ordered the immediate arrest and prosecution of perpetrators of the violence against Okunola.
A statement issued by the Force Spokesman, Mr Frank Mba, an Assistant Commissioner of Police, on Friday in Abuja, said the suspect was arrested in his hideout in Abuja.
Mba said Adi was a candidate of one of the major political parties who contested for the House of Representatives seatfor the Brass Federal Constituency in Bayelsa.
The Spokesman said that two other persons arrested in connection with the incident are: Tamarapreye Victor, 34 and Azi Newton 34.
Mba said that effort was ongoing to apprehend other members of the gang involved in the unwholesome attack on the officer.
He said that as the governorship and state Assemblies elections holds on March 9, the force would not condone any act of assault against members of the public or personnel of the force on election duty.