This is definitely the key point of the issue. As long as people aren't arrested for 'intent' to commit a crime - which is really impossible to prove without a

This is definitely the key point of the issue. As long as people aren't arrested for 'intent' to commit a crime - which is really impossible to prove without action - this tech might help out a lot. If it works as advertised and is used responsibly, it might help bring certain areas closer to security, instead of security theater. The privacy implications need to be managed carefully; it's probably too much to ask for them to not be botched.