killing cops is simple.. go to a jump path.. break out of it somewher ein the middle.. then begin shooting the gate to kill the path.. begin nuking incoming transports for goods. then sooner or later a patrol of cops will zip in on the path.. kill them.. you should be able to handle them reasonably. then keep this up.. if too many come.. bring up the afterburner or warp drive and make a break for the closest active jump path midgate and get out of dodge. That's how original freelancer was at least.