On the self incrimination issue. One could always refuse to comply, like many do with field sobriety tests. If you have a valid license and are pulled over for a minor infraction, what's the cop going to do? Arrest you when he already knows you are free from outstanding warrants?
Like I said, the only way this tool has any validity is with individuals with no official ID, like an Illegal Alien driving with no license.
It isn't surprising that Kansas often leads the way in this, and similar, useless and nonsensical follies since the state government and congressional delegation has been captured by religious fundamentalist fanactics noteable for their collective ignorance in the art and science of governing. The harm they've imposed on their state covers the entire spectrum of life will cause the residents for generations. This one is just one of the lesser stupidities at large in the once great state of Kansas.