IMHO, and I don't profess to be in LE, or an attorney. If there is a missing child LE should do anything they can to get information as to the welfare of the missing child. Arresting someone isn't necessarily going to help at the get-go.
Like in the Cummings case - lots of pressure, no arrests, until it was obviously too late, and they (Ron and Misty) were arrested on drug charges.
In the Dunn case, LE is pitting Shawn against Billie right now in hopes someone will crack. Easily done by threating child *advertiser censored* charges against the both of them.
In the Duckett case, I personally don't believe it was LE that put the pressure on Melinda -- I think Nancy Grace did quite a job of that herself. Source: wiki.com.
Grace interviewed Duckett less than two weeks after the child went missing, questioning her for her alleged lack of openness regarding her son's disappearance, asking Duckett "Where were you? Why aren't you telling us where you were that day?" Duckett appeared confused and was unable to answer whether or not she had taken a polygraph test. When Grace asked her why she could not account for specific details, Duckett began to reply, "Because I was told not to," to which Grace responded, "Ms. Duckett, you are not telling us for a reason. What is the reason? You refuse to give even the simplest facts of where you were with your son before he went missing. It is day twelve." According to the CNN transcript, Duckett replied, "(INAUDIBLE) with all media. It's not just there, just all media. Period." Grace then moved on to a media psychologist who asserted that Duckett was "skirting around the issue.
The next day, before the airing of the show, Duckett shot herself, a death that relatives claim was influenced by media scrutiny, particularly from Grace
In the Anthony case, I don't believe that LE made George, Lee, or Cindy an Agent for them. They were trying to find a missing child and would go to any length to do so. What is wrong with that? IMHO I think Baez's feelings are hurt because LE tried to go around them. I say kudos to LE, they wanted to find Caylee, pure and simple.
MOO
Mel