Wired News reports that a company called Verichip has produced a chip that links the user to the firearm. So if you don't have the right chip the gun doesn't work.
Verichip announced a partenership with FN Manufacturing to produce "smart weapons"...
When will they put it all toguether so we can have cybereye targeting scope and smart guns that shoot automaticatically when the gun aims into the target you selected?
And while they are at it they could add a shock to the gun to make the person drop it too... ;)