The consensus is that its a bad idea to complicate something that you may need to function 100% in a life or death situation. The solution to junior finding your gun is to store your guns in a safe if you have kids.
From wikipedia
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Many firearm enthusiasts object to smart guns on a philosophical and regulatory basis. Gun ownership advocate Kenneth W. Royce, writing under the pen name of "Boston T. Party", wrote that "no defensive firearm should ever rely upon any technology more advanced than Newtonian physics. That includes batteries, radio links, encryption, scanning devices and microcomputers."[30]
In an article in Forbes, information security expert Joseph Steinberg discussed several technological shortcomings with smart guns that might “create new, serious safety issues for gun owners and non-owners alike.” Among them were claims that “biometrics take time to process and are often inaccurate – especially when a user is under duress – as is likely going to be the case in any situation in which he needs to brandish a gun,” “it is not ideal to add a requirement for power to devices utilized in cases of emergency that did not need electricity previously. How many fire codes allow fire extinguishers that require a battery to operate?,” “smartguns might be hackable” or even “susceptible to government tracking or jamming,” and “Firearms must be able to be disassembled in order to be cleaned and maintained. One of the principles of information security is that someone who has physical access to a machine can undermine its security."
https://en.wikipedia.org/wiki/Smart_gun#Controversy_and_Criticism
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