Until someone comes up with a way of discerning intent, none of this security equipment is going to be any great use. In George Orwell's Nineteen Eighty-Four, the Thought Police were able to control the population using a mix of psychology and surveillance. However, it seems this was a teensy bit labour-intensive, and if replicated in the real world might be considered over-intrusive. But perhaps we might nonetheless be better using more psychology and surveillance, and fewer physical searches generally.