After researching a number of conflicting articles on the exorcism of Roland Doe and studying the Jesuit priests diaries, I can now give you the facts surrounding the lead up to and the actual exorcism from the best of my knowledge.

In the main, exorcism is thought of as the rite of driving out the Devil and his demons from possessed individuals. However, technically speaking, exorcism is not driving out the Devil and his demons, but more accurately, it is placing the Devil and his demons on oath.
Battlling with demons – possession – the true facts!