It probably depends on the state; in many states you can't get out of a parking ticket by saying you weren't the person driving and there's no reason to not use

It probably depends on the state; in many states you can't get out of a parking ticket by saying you weren't the person driving and there's no reason to not use the same process for speeding and red-light cameras. Of course that requires changing the laws, and some states did not do so.