Actually, the obstacle to prosecution is that nasty little principle of being guilty beyond reasonable doubt.  When two people give conflicting information about an event and there is zero evidence supporting the words of either, one can never be sure what the truth is.  Clearly the woman could have been motivated for the 1 million she will receive as a result of the civil suit.  People kill for less.  Two comments: First, the session should have been videotaped.  Second, the fact that there's zero evidence of alleged actions says something about how significant the event intrinsically is.  If one touch is devastating, the woman is, IMHO, mentally ill.