Handcuffs with tasers - High-tech handcuffs can shock, inject prisoners ... They're based on the principle of the Taser, which uses electrodes to administer high-voltage .......
http://www.engineering.com/DesignerE...er-Future.aspxIn addition to being able to immobilize prisoners, the handcuffs are stuffed with sensors that would allow location tracking. For example, the cuffs can be used as proximity monitor which would warn a prisoner if they are getting too close to a restricted zone. In addition this same proximity monitor could be used to separate two prisoners who aren’t getting along.
The handcuff patent goes on to describe one more interesting feature, and that is its ability to administer drugs or sedatives by means of injection.