The key initiative in smart gun development is ensuring that only a single user can operate a gun. How to do that is still under consideration. One promising technology under development at the New Jersey Institute of Technology is an ambitious multi-point biometric sensing array known as Dynamic Grip Recognition. Sensors in the grip and trigger measure the holder’s hand size, strength and even “grip style” – how they place their fingers on the gun. If the data matches up, the electronic safety releases and the gun can be fired. In tests, it has 99% recognition accuracy, making it a very promising future option.