harm bryan, so investigators got a search warrant for his car. it was checked for blood and gunshot residue. >> none of which we found. we didn't find anything. >> in addition, dale and christie bradley agreed to take polygraph tests and they both passed. >> at that point, they kind of dropped his name from the list of suspects. >> meanwhile, investigators pursued another potential lead. two of bryan's fellow security guards had been arrested for stealing from the mine. >> they were arrested for stealing metals of kennecotte property and pawning them for junk metal shops. >> one of those guards was at the guard shack minutes after bryan was reported missing. >> bryan was one of those at the guard shack who reported some of those thefts going on. without bryan's body, police had no proof he was dead.