>> i did confess to certain policemen that i had dreams, that i did things. >> but investigator gary miller had other evidence. like the witness who drove by this cornfield the night of jessica's murder. >> that person testified he was absolutely sure that when he went by here on that night, there was a van, there was a guy coming from the cornfield to get in his van. >> and a search of hull's house and van revealed he'd been casing out small college towns and keeping suspicious notes. seen joggers and bikers, many alone. check colleges, parks. seen some prospects. hall also made lists for the hardware store. buy two more plastic tarps. cover all floor and sides of van and hall wrote himself troubling instructions.