I think the most frightening aspect of this case is that Michael Schiavo might have actually been having sex with Terri behind closed doors. Or abusing her in some other way. I put NOTHING past that monster.
When he's not around he could have a staff member that keeps Terri shot up with some mind altering drugs making it impossible for her to talk.. A blood test would prove this, huh? Heck she might be able to talk and we don't know it.