Needed: Legal Advice on what can be done to stop elderly driver

My father who is 75 seems to be slipping into Alzheimer's, and is definitely having session of dementia. He decided to move from Arizona to Rockford, IL, and hitched up his car behind his RV and headed east. He lost his car somewhere in Arizona (he thinks). He got a ticket in Missouri, he was hospitalized in Wisconsin for 8 hours after being pulled over by a trooper because of erratic driving, and they suggested he might have had a couple of mild heart attacks. He decided to head to the upper peninsula in Michigan to see his sister, and was pulled over by the State Troopers outside of St. Louis after finding him driving the wrong way down an interstate. The troopers said that he stated he thought he was outside Chicago. He was sent to a hospital in a complete psychotic state, complaining of hearing and seeing ghosts in his RV. He spent a week there, and I picked him up yesterday.

I refused to let him drive his RV, and it was a major battle. Even after admitting he has no clue about how he got from Wisconsin to St. Louis (an 8 hour trip), he does not recognize that he has a problem.

We are now keeping him prisoner essentially, and have disabled his RV. We assume he has another key stashed somewhere, and there are signs he is planning on taking off as soon as he is unsupervised.

I am told by the social workers that worked with him in Illinois that there is nothing I can do to get his license taken away and to stop him from driving in Illinois. This seems insane. The troopers that picked him up in Wisconsin and St. Louis did not give him a ticket, so there is no official record of him being dangerous on the road.

What can I do to get his driving privileges revoked, and get him off the road? I am not positive he would obey the law and not drive if he lost his license, but he might. Even if we take the RV away from him, and his lost care is not returned, he is likely to buy another car. I would like to be able to prevent him from registering another car.

I cannot believe that the law does not act in the public interest in cases like this, and have provisions for getting someone who is clearly incompetent off the road.

Any legal expertise or personal experience would be much welcomed!