[pen_theGun]

(IsACopCar(carid)) // 'carid' not defined

IsACopCar( GetPlayerVehicleID( id ) ) // here is no need to define something

pawn Код:

if (IsPlayerConnected(id))
        {
            if (IsACopCar( GetPlayerVehicleID( id ) )) // <=====
            {
                SendClientMessage(id, 0xFFFFFFFFF, "You have been cuffed and cannot move");
                TogglePlayerControllable(id,0);
                return 1;
            }
            else
            {
                SendClientMessage(playerid, 0xFF0000AA, "You're not in a registered cop car");
            }
        }