This is astonishing!
The head LAW ENFORCEMENT officer writes a letter encouraging ILLEGAL activity!
He might as well have written a letter pleading, “Let gang-bangers who are mad at each other murder each other freely in my county.” Or, “Allow poor people who really NEED the items shoplift without penalty.” Same principle, differs only in the details.
There is no requirement that each state recognize the other's driver's licenses. Indiana State Police could start a daily stop and show to see if someone had an Illinois license on the Tri-state ~ and simply tow offender's automobiles of to the side or resale at the nearest auction site ~