If there’s a way to make it impossible for the government to use facial recognition to monitor people other than legally banning them doing so, it’s hard to imagine it.
government monitoring people by itself is not a problem, government monitoring people to harm people is the problem.
What need to be fixed is the usage of tools to harm people, not the tool itself.
I thought the election of Trump would disabuse people of this idea that it’s smart to hand more and more power to central authorities. But at this point I think it’s hopeless. People just want the state to be Daddy, and assume or hope that its power will always be wielded by people they like against people they don’t.