(NewsNation) —The gray backpack worn and discarded by the UnitedHealthcare gunman that was found by authorities could be a “treasure trove” of evidence to trace him, said security expert Tim Gallagher. The suspect’s DNA and other weapons could help the manhunt, he added. As the search continues, public sympathy for the CEO is low because people feel these companies have long “victimized” and “violated” them, said Wendell Potter, a former health executive.