... Tell me more about this Tau Centi fiasco
It may be the wine I had this evening but...I mean, I can't argue with you on most aspects of this discussion. I do, however, fully stand behind the biometric device. I believe it's a great idea to prevent illegal use of handguns which lead to incidents such as the one here. Your wife/friend/neighbor may not be able to play with it at the range, but maybe something can be done about finding a way to activate/deactivate the device. Only you as the owner would have the option to do so though.
And the argument where someone threatens you at knifepoint or whatever is a bit silly, but I was trying to look at every viable option to try to cover all grounds in favor of the biometric device.
I do have to admit that you're probably the first person with a different belief than mine who's successfully managed to get me to agree with some of their viewpoints.
Not every teacher should be armed and any who are should be processed, vetted, trained, and kept on a living record. It should be a conceal carry option for those that qualify in it, with the addition that if a school does not wish firearms to be on the campus in the hands of teachers, either because they cannot afford a privately owned weapon or because ideologically they are against firearms, there should be a waiver written for it. This would place all liability on the school itself and it need to find alternative means that afford the same level of protection, be that a police officer, rather officers, by an agreement with local or state law enforcement, or by using other techniques such as metal detectors, interlocks, and screening areas to achieve roughly similar effect.
I certainly do not believe every teacher should be armed, but those who are should be held to the highest standards of reliability and follow processes the federal government already uses for the arming of its members and when they are not authorized to bear firearms. Example being that if said certified teacher is on medication that is mind or mood altering, they are not permitted to carry their weapon; same with those undergoing counselling or those with financial issues. In short, lift a process from one side that does work and has worked and shift it over to the other.