Anyone who thinks that they could ever produce a "smart weapon" that would prevent unauthorized use while making the weapon as reliable and available to the owner is a fool.
What if my wife needs to use it?
What if I need to use it with my off hand?
What if I'm wearing a glove?
What if my hand is bloodied or covered in mud and I need it?
How do you transfer ownership without creating a system that is secure without being prone to abuse?
How do you propose to retrofit all of the weapons in homes today?
Its bullshit SciFi to even think about it...
Except it basically already exists
There is lots of different bio-metric technology out there
There is no reason you can't have more than 1 user. Biometrics can be used with gloves and dirty hands.
I haven't thought about the transfer issue
Rather than identifying something fixed, like a fingerprint, a "dynamic" biometric system measures changes over time. As it turns out, the way you grip a gun—all the little changes in pressure as you squeeze the trigger—creates a pattern that's unique to you. What's more, the pattern is consistent: it can be identified even if you're tired, wearing gloves, or even if your hand is injured. (It turns out that your signature works in a similar way: the changes in pressure over time as you put pen to paper are far more consistent and recognizable than the way your signature actually looks.)