The Bishop of Iowa’s largest Catholic Diocese says he’s apprehensive as he heads to Dallas to participate in a conference on sexual abuse policy. Radio Bishop Joseph Charron says past gatherings of the nation’s Catholic bishops have been a time to meet old friends and relax. Charron says this two-day meeting is much different.He says he’s apprehensive because of the expectations placed on the few days and that they must at least get a beginning response to something he says they haven’t handled well in the past. Charron says the so-called “zero tolerance” policy will likely be one of the key points of discussion.Charron says some people have some trouble with the policy. He says there are questions in how the policy would apply to cases from several years past. Charron says there’s a top goal he seeks in the meeting.He says the “non-negotiable” point for him is the protection of children. Charron is leaving this afternoon for the meeting that begins tomorrow in Dallas.