Now they cant charge her with murder anytime soon. They cant go one day and swarm in with officers asking for proof that this girl Kaylee is who she says she is and not Caylee, and then turn around and charge Casey with murder. It would look like they are charging Casey when they think there is a chance that Caylee is alive. If they wanted to pursue all leads and they wanted to show that they checked out this lead, they should have done it quietly. There is now way they will look credible now if they charge her now.
Either they have evidence of a decomposing body that is Caylee or they do not.