Uh...How about "I've been fired?"

Gun: "I've been shot"

The Weaver Stance is the way cops hold a gun when they mean business. It was invented in the 1950s by Los Angeles county deputy sheriff Jack Weaver and means using both hands to grip a weapon for steady aim and controlled recoil.

But when a cop is "Weavering" he or she cannot grab a radio and transmit an all-important message, to call for urgent back-up for example. So inventor Kevin Sinha of Georgia, US, has come up with a simple way around the problem and Motorola, which has made police radios for many years, has pitched in.

The idea is to give guns a Bluetooth transmitter chip controlled by a sensor which detects when the firing pin is triggered. So every time the gun fires a shot it automatically sends out a low power radio signal to a belt-mounted GPS radio which determines its wearer's precise position.

So, BANG, and the belt radio transmits a pre-recorded message saying "gun fired, send backup" accompanied by the GPS position. If shots are fired but there is no need for backup then the cop can use the radio to send a manual message to cancel the cavalry.

(Source link not included in post; No Google results.)

h/t to The Propwash Gang