dr. hamilton declined our requests for an on-air interview. he later told us he reported his potential conflict to the government contractor that manages peer reviews for the epa and that they decided this did not represent a conflict of interest, particularly since he would participate in the panel before engaging with p.g.&e. in the town hall meeting. we did speak with p.g.&e. sheryl bilbrey is director of the chromium remediation team. >> his role has been to explain the toxicity of hexavalent chromium. he does not discuss any part of the regulatory process. p.g.&e. expects anyone that works for us, that they will maintain their professional integrity and be completely independent of any regulatory process. so we wouldn't expect josh or dr. hamilton to change any of his advice. >> reporter: sometimes, though, the appearance of a conflict is a conflict, isn't it? >> i don't think so. i think as long as everyone knows that dr. hamilton does work for us and he is very well respected, so i think his credentials really speak for him. >> reporter