The suspect, Mohammed Amin Iddrisu, was in the company of two accomplices when the policeman was shot on September 14, 2014.
Following the incident, the police managed to arrest one of the suspects, David Johnson, 22, a Burkinabe, while Iddrisu and the other accomplice who is yet to be identified fled.
Johnson is currently facing trial.
Briefing journalists in Accra yesterday, the Deputy Accra Regional Police Commander, Assistant Commissioner of Police( ACP) Mr Timothy Yoosa Bonga, said the policeman had tried to stop the three men, who were on a motorbike, at the Weija Toll Booth, near Kasoa.
He said when the three men failed to stop, the policeman, who was also on a motorbike, became suspicious and managed to cross them with his bike.
“Immediately, one of them pulled out a pistol and shot the policeman in his thigh and fled into a nearby bush,” Mr Bonga said.
Following the incident, he said, a patrol team in the area pursued the three men and managed to arrest Johnson, but the other two escaped.
Through intelligence, he said, the police gathered that Iddrisu was the main suspect who had shot the policeman.
Iddrisu was eventually arrested on April 13, 2015, while investigations continue to get the third suspect arrested.
The policeman, whose identity has been withheld for security reasons, was admitted at the Police Hospital in?Accra for some time but he has since recovered and resumed duty.