You should see what happens when you hand them a militaty ID. I've yet to see law enforcement carry a CAC card reader, even in towns that have military bases. Unless they have the proper scanner all they get is a pic, name, and which department under DOD I work for. Everything else is stored in a combination of barcode (pixel code might be more accurate description actually, magnetic swipe, and embedded computer chip.

Of course I also doubt the whole issue of technically not being allowed into a federal building (including court rooms, even if you are he one on trial) without a RealID compliant license carries much weight when you pull out a DOD access card for ID.