Defense challenges medical examiner's conclusions in Anthony trial

ORLANDO, Fla. (AP) - The defense in the Casey Anthony murder trial has attempted to poke holes in the medical examiner's testimony about how 2-year-old Caylee Anthony died in 2008.

The chief medical examiner for Florida's Orange and Osceola counties said today duct tape on the little girl's face played a role in her death. Prosecutors showed a graphic video of how duct tape could have been used to suffocate her.

The defense contends Caylee drowned in her grandparents' pool.

The medical examiner acknowledged under cross examination that toxicology tests found no evidence of "volatile chemicals," like the chloroform mentioned in earlier testimony.

When the defense challenged whether it was "100 percent that this death couldn't be an accident," the medical examiner said "Accidental deaths are reported 100 percent of the time -- unless there's reason not to."

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