Drivers license recognition has nothing to do with Federal laws or the full faith and credit clause. It is a voluntary agreement that the states have entered into. The acceptance of out-of-state DL is completely up to the states and the laws covering the license is not universal. The reporting of violations is voluntary and not all states are members of the agreement. To use drivers license as a comparision to CCW is completely wrong. As for the Feds getting involved you need to check out the CDL laws. That is completely controlled by the Feds and shortly after implementation they saw how screwed up it was and still is.