Yes. It's a state agency that usually falls under the Department of Transportation.
YES
In the US that agency is the Dept. of Defense.
Return you license plates to Dept of Motor Vehicles.
Not automatically. However, anyone who suspects a person may not be safe to drive can, and should, report it to the Dept of Motor Vehicles.
dept. of information
Call the dept. of Motor Vehicles in your area and FIND OUT!
Call the Dept. of Motor Vehicles in your state. They handle it, they will tell you how.
dept. of information
In California you need a copy of your Dept. of Motor Vehicles registration.
Yes, typically for a fee.
[ U.S. ] dept of agriculture
A call to your state Dept. Of Motor Vehicles should answer this question.