Well, he does know the background. I doubt there's any danger in just having him assist....

Tom, President of University: [discussing the case, referring to Karras] Well, he does know the background. I doubt there's any danger in just having him assist. There should be a psychiatrist present, anyway. Bishop Michael: What about the exorcist? Have you any ideas? Tom, President of University: How about Lankester Merrin? Bishop Michael: Merrin? Why, I'd a notion he was over in Iraq. I think I read he was working on a dig near Nineveh. Tom, President of University: Yeah, you're right, Mike, but he's finished. He came back three or four months ago. He's at Woodstock now. Bishop Michael: What's he doing there? Teaching? Tom, President of University: No, he's working on another book. Bishop Michael: Don't you think he's too old, Tom? How's his health? Tom, President of University: He must be all right, he's still running around digging up tombs. Besides, he's had experience. Bishop Michael: I didn't know that. Tom, President of University: Ten, twelve years ago, I think, in Africa. The exorcism supposedly lasted several months. I heard it damn near killed him.