I'll tell you why they don't want to. It's because the true purpose of the scanners is to create a biometric record of every citizen. In the next few years, there will be scanners at every court house, bus station, train station, shopping mall, government building, college campus, etc etc etc etc. You won't be able to go anywhere without being instantly recognized, even just walking down the street.
This is the plan. It's up to us to stop it right here, right now.