April 26 (Bloomberg) -- The way you grip a baseball bat, a tennis racquet, or even a gun is unique only to you. It's what's called a "behavioral biometric." And The New Jersey Institute of Technology has been using that fact to develop technology that would attach to the grip of a gun so it will only fire if it recognizes the grip of the registered user. This type of technology was seen in the latest Bond movie, "Skyfall." Bloomberg's Matt Miller reports.