Gay exorcism and body possessing
One of the interesting things about sharing my experiences openly is that some friends feel comfortable asking me questions they won't ask other people. For instance, after some people in Connecticut performed some type of "gay exorcism" ceremony recently, several people who know about my body-switching experiences asked me if I thought there really could be some type of "possession" like this.
In short, based on my own experiences, no, I don't think there can be a form of bodily possession like this, at least not in the long term. I believe I've done it several times for very short periods (documented here and here), but every time it happened I was very aware that I was Al, and my consciousness was in someone else's body. I have a friend who also did this once, and she described her experience just as I have: you know who you are, and that you're just a visitor in someone else's body.
I was going to comment more on the people that performed this exorcism, but I don't have anything good to say about them, so I'll leave it at that.