Michael Schiavo is the legal guardian -- he won't allow it. He has spent almost a $1 million trying to kill Terri.
He has been referred to as a monster in another thread for many reasons.
Why can't the court take over legal guardianship and order the tests? If there is substantiated reason to believe he is the cause of her injuries, then that should be done. I am surprised that the hospital did not order it done when they were sued, or rather their attorneys.