In order to receive police radio information, parse it, and output a response to another device, like an Arduino and create the wearable, I will need to complete these two tutorials:

Adafruit’s raspberry pi SDR police radio scanner guide comes with a list of components needed to turn a raspbery pi’s computing power into a radio.
https://learn.adafruit.com/freq-show-raspberry-pi-rtl-sdr-scanner/overview

and

A nice instructables guide shows that it is possible for an Arduino to read radio frequency! It’s quite the hacky process because Arduino can only read between 0V and +5V, there are a few steps to transform the radio wave to fit. This combined with the raspbery Pi, and i should be able to hook up some vibration motors to place around the hoodie to create haptic feed back for the wearer.
http://www.instructables.com/id/Arduino-Audio-Input/step2/Prepare-audio-jack/