My father used to work for the DMV, California. He pulled an old guys license and refused to give it back. The State received a very nast letter from the former drivers son. I'm not sure if my father really should have done what he did, but his supervisor was not very happy with him, and later on, my dad lost his license as well.
I took my father's keys when it was clear he was no longer safe driving. Despite his strokes and other medical problems, the CA DMV never cared and did not lift his license even when his health and incapacity was reported.