Defense bug expert: Prosecution theory doesn't add up

(CNN) - The kind of insect evidence found by investigators in the trunk of Casey Anthony's car does not prove that a body was stored inside, a bug expert for the defense testified Friday in the Orlando woman's murder trial.

Prosecutors used their cross-examination to vigorously challenge forensic entomologist Tim Huntington on his experience, an experiment on a pig and why he omitted a key opinion on a stain photo from his pretrial report.

Jurors previously heard from prosecution witnesses who testified that the discovery of one leg of a kind of fly commonly found around decomposing bodies, as well as more numerous examples of a different kind of fly, suggested that a body had been stored in the trunk for no more than three to five days.

Prosecutors allege that Anthony killed her 2-year-old daughter, Caylee, and stored her body in the trunk before dumping it in a wooded field in June 2008. Prosecution witnesses have testified about a subtle stain and a strong odor inside the car as evidence that a body had been decomposing inside the trunk.

But on Friday, Huntington told jurors that the evidence is not convincing.