Good point by mclarke, you must get a release signed.
And this time Ted\Ed is correct, your insurance agent is full of crap. They are the ones who will insure your vehicles and drivers.
Try this, tell them you hired someone convicted of a DUI and see what they say. I bet they change their tune real quick.
“Every step we take towards making the State the Caretaker of our lives,
by that much we move toward making the State our Master.”
~Dwight D. Eisenhower