Comment by ruffrey

It is hard to tell if this is a joke based on the username. There are people with this perspective though I assume. Thus I will respond to it.

It's worth noting OP's proposed technology is impossibly far from existing in practice. Importantly, there are at least half a billion citizen-owned firearms in the USA without this theoretical technology, already. Therefore we should focus on something more effective. Such as better mental health treatment, bullying prevention, gang prevention, or any other precursors to violent behavior.