While playing, press Shift and ~ to bring up the console. Next enter any of the codes below:

nc17 = More gore.
casual = Play without uniform.
Johnwoo = Slow motion.
iamleet = Beat current mission.
Justion = Suspects never surrender.
hotstuff = Makes the game harder.
Swatlord = Makes entire team invulnerable.
noshades = All missions played during daytime.
Doubleshot = Fire in pulses.
Whosyourboss = Forces teammate to open fire.
Biggerpockets = Unlimited ammo