Red John is not a woman.
Assuming time and space exist, Red John is not Patrick Jane.
Red John is under 6 feet. (aka: NOT Walter Mashburn or Wayne Rigsby)
Red John is not fat, chubby, flabby, or soft (aka: not La Roche)
Red John is alive.
Red John is not in prison. (aka: not Dr. Roy Carmen)
This eliminates more than half of the people on this suspect list.
Why do people keep posting theories that contradict known Red John facts.
