Nowhere in my previous comment does it say that I'm opposed to lack of privacy in public so I'm not sure how to respond to your comment -- that's not my issue. My issue is that someone shouldn't be targeted for monitoring on the basis of their immigration status. Either do it for everyone or nobody. If you're going to do it for everyone, then have a technical framework in place to ensure (to the best of our ability today) that the system cannot be abused by an errant clown, and have the procedures to provide transparent auditing etc possible and enforce these audits. Otherwise, it's my opinion we'll end up with a corrupt, abused system.

Interesting intellectual question for you -- if I have no rights to privacy on going outside, what are your views on the government making it illegal for me to obscure my identity when I'm in public (say, with a mask?)