a police officer.
a cop in a patrol car gave chase
police officer,policeman,policewoman,officer of the law,law-enforcement officer/agent,officer,constable,patrolman,trooper,roundsman,peace officer,kotwal,gendarme,jack,uniform,copper,bobby,rozzer,busy,bizzy,plod,PC Plod,bear,walloper,demon,flic,flatfoot,bogey,flattie,woodentop,pig,peeler,runner,bluebottle,finger,the police,the police force,the forces of law and order,the constabulary,the law,the fuzz,the boys in blue,the long arm of the law,the (Old) Bill,the force,the heat,the filth,Babylon
catch or arrest (an offender).
he was copped for speeding