Woah. I didn't realize Chad was Crystals stepbrother. Alrighty then..
I haven't heard anything about him being looked into, polygraphed, etc. but I really hope he has been. I also haven't heard anything about his relationship with Haleigh, his whereabouts when she went missing, nor have I seen him do any kind of interview, plea for Haleigh, or have I ever seen him on any media outlet. To me, that's very strange. If I were getting ready to become a step parent (like he is) I'd be begging for Haleighs return, just like everyone else.
NG would have a shouting good time with this "bombshell"...