[Span1ard]

Quote:

drivable by anyone.

search public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger) in your gamemode and add
if(!IsACop(playerid) && !ispassenger && IsACopCar(vehicleid)) { RemovePlayerFromVehicle(playerid);}
you should write public IsACop(playerid) and IsACopCar(playerid)

The filterscript with gates is better for integrating in gamemode and too to use IsACop(playerid), when enter command /open...