Scully: Was he a practical joker?
Dr. Nollette: On top of all his brilliance, he had a genius for executing elaborate schemes.
Mulder: Could he be making it seem like a man with a 70 IQ is gaining access to and, uh, operating his old computer files?
Dr. Nollette: Arthur would still have to be alive.
Scully: Could he have faked his own death?
Dr. Nollette: No.
Mulder: The police report on the auto accident that killed Arthur Grable is woefully incomplete. The dry road surface, no mechanical problems found. The body was never admitted to the county morgue and there was no funeral.
Dr. Nollette: If, uh, you are trying to suggest that Arthur Grable killed Surnow and Keats and is after me next, you're way off. Art could not have done the murders.
Scully: How can you be so certain?