Cats out of the bag with facial recog. Might as well have strong legal documentation and judges on the line with this.
And when the expansion is justified by shocking statements ("stop terrorists and pedophiles, think of the children" type stuff) that's when people should stop and think. Because anyone trying to convince you by shocking you probably wants to hide something in that shock.
I think most people would be fine with using facial recognition technology in the instance of Amber Alerts or an escaped dangerous fugitive.
Likewise, I think most reasonable people would not feel comfortable in a situation where software is bulk scanning the faces of people entering a stadium and checking them for outstanding warrants for unpaid parking tickets etc.
A technologically sophisticated and ruthlessly efficient justice system in a progressive jurisdiction is far more oppressive than a backward, ineffective one under an authoritarian regime.