Heaps of documented cases for sure about this particular subject but what or where is the byline?
Interested to see where your thoughts are roaming on this as 'Free Will' implies we dont have it to begin with.....
Then if this is not the scenario, it stands to my way of reasoning that 'We are not in control of ourselves in any measure at all but rather subject to 'Anothers will' and therefore without a will of our own....
In which case perhaps it can be considered that we are biological robots (mindless slaves)set to discover and determine what 'Free Will' actually is....maybe :)and that we only think we are intelligent and thusly 'Willful" so answering the question with some justified aplomb!