Remember, smart gun technology is a Trojan horse -- wherein the defects which are not currently inherent to guns, and never have been found to exist in court, will be designed in -- and the manufacturers will be sued into oblivion.
A list of the type of defects follows, courtesy of a poster, whose name I don't remember, back when I used to hang out at the old Time Magazine Pathfinder boards:
On Smart guns
Actually - you might wish to consider the real world when you talk about electronically personalized firearms, you will end up with specifications something like this ----
Must be able to be used with either hand
Must be able to be used with gloves
Must allow others to be permitted to use the firearm
Must not significantly increase weight or size of firearm
Must have 100% reliable power supply (if needed)
Must have extremely low rates of false negatives and false positives
Must not be affected by temperature, dirt, precipitation, oils, solvents, or perspiration
Must not be affected by calluses, abrasions, lacerations, or other tissue damage or variations
Must not work simply because owner is in close proximity to firearm when another person is using it
Must not be simple to cheat or remove
A temperature range requirement ( -50F to +150F).
Must not be disabled -
by immersion in water.
by exposure to and operation during inclement weather.
by proximity to magnetic fields such as those in industrial facilities.
by proximity to microwave sources such as transmission towers and ovens.
by proximity to radio and TV broadcast towers. (or the radio in LEO vehicles)
by proximity to AC and DC magnetic fields under high voltage transmission lines.
by NMP
Must complete analysis and be in "go" mode in a maximum of 0.25 seconds after application of control digit.
Must be in "no-go" mode in a maximum of 0.1 seconds after control digit is removed.
How much wiggle are we going to allow the control digit to have on the sensor pad before this contraption says that is not the correct control digit?
Must be serviceable at local firearms dealer or armorer. Requirement to return to factory and have authorized user at factory is unacceptable.
What is the useful life of the electronic components that we are putting into this service? Are we going to measure service life by hours energized, or by shots fired, what? Should we
consider the service life to be longer if installed in a pistol chambered for 9mmX19mm than we would for installation in a pistol chambered for .45ACP? What happens if we put these
electronic components in a Contender chambered for .45/70 Gov't? Must be capable of absorbing without failing the impact loading from a minimum of 10,000 shots.