To get the cop, you have to go to arcade mode and change it to
circuit.  After that you pick a track for circuit (LA will give
you thee LA cop Paris Will give you the Paris cop and Tokyo will give
you the Tokyo cop.  The Tokyo cop is the best.) After you have
picked the track beat circuit races 1-5 for LA 1-6 for Paris and 1-7
for Tokyo.  If you want it to be easier put in the codes to make
it the easiest and the code to get the guns and rockets so you can
blow up the racers.