"I don't know how smart Scott is, but he is a college grad, and it would not take a lot of smarts to say that he had gone fishing somewhere else...like in the opposite direction from where the bodies were found."
Well, his mother must have had some doubts. Two key statements made by her to him:
"No one could have been that dumb--not even you, Scott."
and,
"Deny, deny, deny."
"No one could have been that dumb--not even you, Scott."
and,
"Deny, deny, deny."
Hearsay. Did you hear her say this? Who did you hear say that they heard her say these things?
Nevertheless, one wouldn't have to be a mental giant to not announce that he was at the remote scene where the body was disposed of.
Also he would have to be really stupid to not deny that he had done something he hadn't done. Denying is not an indication of guilt.