Ahmedabad, Sep 8 (IANS) Ahmedabad Police Commissioner O.P. Mathur Monday awarded a certificate of merit and a cash prize of Rs.2,000 to police constable Nagjibhai Baldevbhai Desai for catching a prisoner who had escaped last week.Jayesh Ramjibhai Parmar was brought from the central jail here to the civil hospital for treatment when he gave the police a slip and escaped Sep 4. Desai managed to nab him Sunday after a chase at the Adalaj crossroads on Mehsana-Ahmedabad highway.