The Register reports about a european police conference in Berlin, Germany. One of the real challenges on the street is to make sure that criminals can not use the policemen's gun. The conference that was more a kind of trade show but with man discussions on the floor showed one wearable system that could make sense.

A German producer of digital security systems for firearms has launched a blocking device that is inserted into the barrel and can only be removed with a pin and/or fingerprint authentication. The biometric interface can be worn around the wrist, and transmits the authentication signal via radiowave propagation.

I prepare the PIN version, otherwise s/lo could "rent" my finger...

Via Keeping Bobbies ahead of the bunch | The Register