I absolutely agree with Ridgerunner665.
Like I posted elsewhere, imagine a child--little Dottie--playing with her mother's jewelry which just happens to include the ring, bracelet, watch, etc. necessary to enable the "smart" gun mommy has left laying on the jewelry table.
Or maybe the gun left laying out because the doodad is going to disable it is stolen by an older child or criminal and the mechanism defeated and bypassed.
This technology is totally bogus in preventing use by criminals or anyone else who would steal it.