Using cameras to detect guns in schools?

Yesterday, my family went to my daughter's school here in Washington state. And they were warned that they might find people with fake guns as they were testing a system to detect them via the cameras already installed. With all the different discussions I have read regarding gun control and what can be done to prevent mass shootings this is the first time I hear this tech approach. I don't know if this is standard or a pilot program, and I don't even know what type of technology is behind this system, so I can't judge its effectiveness, but this had me wondering. What does Blind think about this type of tech based approach? Do you support for something like this? Something else? Or do you just don't believe there should be anything done about it.