Assemble the circuit like this: power + pulse + wire + rgb led + inverter + long led .
Using your screwdriver, set the pulse to a fast blink rate.
Set the rgb led to either blue or red.
Put a red or blue marker cap on the long led.
Hide the power and pulse inside the car if you can. Gently use zip ties or glue dots to place your flashing police lights on top of your car.
Voila! You are now the police. Roll into the room like you mean business.