Comment Re:Reliability, reliability, reliability. Left han (Score 1) 1013
Non-lethal is only useful when there isn't an immediate threat to someone's life.
When you absolutely need to be sure someone won't kill someone, there's only one way to do that. That's why police don't wield tasers when confronting an armed criminal. They wield them when confronting someone who is acting wildly, but is not an immediate threat. (A Youtube video comes to mind where someone is going bat crazy at a police officer for writing her a ticket. She starts slapping him so he tases her.)
Using a taser against someone carrying a shovel is one thing. Using one against someone carrying a full-auto M14 is another.
To your point though, I'm not sure if keeping any gun/taser in a classroom is a good idea (unless it was on the teacher's person, in a holster). Too much can happen and a student can gain possession before the teacher can do anything.