However, in the same news report (same URL link), there is this:
"If any evidence to the contrary is provided, it will be vigorously pursued," the statement from Capt. Angelo Nieves said. "
Why would Nieves say this? It leaves a door open IMHO ... it implies that LE is not absolutely certain of the proof in the lab results, and if LE was certain re officer Allen's comment, then why was the search not changed at that point to a Homicide investigation? They don't have to charge Casey with homicide in order to conduct a Homicide investigation. Seems if they were certain of proof of Caylee's death, they would be doing that and there would be no "Ifs".
LE is not certain of Caylee's death.