You came-up with "novel concept" - train teachers with money of surveillance, not specifying any particular school or country. I implied that you did mean US schools with security problems mentioned in the OP. To suit your narrative of your "novel concept", you suddenly decided that you talk about schools of Australia, not US. I answered - you shall not apply your local knowledge worldwide.
Kids are practically the same everywhere, i.e. the same psychological processes (regarding learning, stress, pressure, conflicts) apply everywhere. The causes might be coming from different directions, but why should that matter, it ends up in brains that work similar and there are limits to what people can take.
Trying to solve social problems with technology is however a hopeless case, because people tend to assume technology is a shortcut to compensate a lack of consciousness of all sorts. But it usually is not, it leads to an even bigger lack of consciousness, is used as an excuse, abused or outright worked around - even if it works perfectly fine, which is rarely the case.
I won´t argue that technology can speed things up and therefore acts like a catalyst in many cases, but it rarely changes why people interact in a certain way on the social level with each other, so if you are concerned about members of a society to cross lines, what would hold them from avoiding this line and cross it somewhere else. It is just messing around with symptoms, not helping with the causes.
You´d practically need to put everyone in jail (including the guards, btw.) if you would want to have some control over this - and even in jails people find ways around rules, because the reasons are unchanged.
The providers of this system are just milking the cash cow with useless impractical technology.
And they build up on the same fearmongering that will not solve the problem as well.