I've suspected that the family refused to take polygraphs. Of course, we expect a suspect/defendant is not going to take one (even if they may be innocent), but folks who are on the periphery -- and especially the immediate family of the missing child -- almost always are MORE than willing to take a polygraph if it will help clear things up for LE and get them going in the right direction.
Makes me sick that they refused, but I figured they had or we would have heard Cindy yelling it to anyone who would listen that they'd all passed and so would Casey, if only her mean ol' atty would let her take one.
So, why refuse if you are not in any way a person of interest or suspect? (1) You've done something you shouldn't have and don't want to incriminate yourself. (2) You know something more/different than you've told LE and know you'd be caught in a lie/incriminate someone else you want to protect.
Can anyone think of any other reason innocent family members of a missing child would refuse to clear themselves with LD tests so police could rule them out and get busy finding the baby?