Interesting question - however, I think they are very thorough in the polygraph with all aspects of the story. I doubt he would pass it if was being dishonest about something this significant.
Just thinking, mostly about the connections Scott could have made on his own if he was selling products to meth cookers.
As to the polygraph, I guess we'd have to be privy to all the questions he was asked while hooked up to know all the answers.
More leaks for us to ponder...
Laci Peterson Disappearance