I have long followed every abortive attempt to develop “smart guns,” handguns that can only be fired by a designated user. Early attempts used magnetic locks, requiring rings on both hands. Obviously, anyone with a magnet could fire such guns, and gloves interfered. Various other methods, including radio transmitters, have also failed. Among the more recent was the Armatix iP1, a .22LR caliber pistol with a watch/transmitter. Back in 2015 the handgun cost $1400 and the watch, $300. Imagine what that would be with today’s inflation. It was rapidly revealed the transmitter could be spoofed with Radio Shack parts costing...