Expert: Casey Anthony's bug defense squashed

For the second straight day, defense attorneys continued to make the case that Casey Anthony did not murder her daughter, Caylee.

All day Friday jurors heard testimony from just one witness, insect expert Dr. Timothy Huntington.

Photos: Casey and Caylee Anthony, Personal Photos

CBS News Correspondent Betty Nguyen reports the defense sought to dispute prosecution claims that bugs found inside the trunk of Anthony's car proved Caylee's body had been left inside.

Dr. Timothy Huntington, forensic entomology consultant, said in court, "Looking at the evidence that was collected, for me there was no reason to assume that those maggots came from a human body."

But under intense cross-examination, prosecutors got the witness to admit he's never worked on a case involving a young child. The closest comparison he had was an experiment he conducted using a pig.

Criminologist Casey Jordan said on "The Early Show on Saturday" that the defense didn't seem to have the best of days with his testimony.

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She explained, "First of all, the guy knows bugs, there's no doubt about it. Yet his replication study, which was done in Nebraska in the fall with a pig carcass instead of a human being, just wasn't enough of a replication for all of his evidence to really apply to this case. So, not a stupid guy - it's just his study didn't fit, and I don't think at the end of the day it came out on the side of the defense."

Jordan added the prosecution's entomologist was, in fact, the professor of the defense's witness.

"(Huntingon was trying) to refute the evidence, which came out with the state's case that it puts the body of little Casey Anthony in her mother's car. He wants to dispute the body was ever in the car and basically trying to say the body was hidden by persons unknown before it was transported to the woods where it was found, but on cross-examination (the prosecution) really skewered this guy and made him say things that were not helpful to the defense."

But what about the question of Casey Anthony's role in this case - will she take the stand?

Jordan said, "Two weeks ago...I said she has to take the stand based on that outrageous opening statement on behalf of the defense, they opened up a can of worms, saying that Caylee died in a pool, that Casey's father molested her - and none of this can be corroborated unless Casey takes the stand."

She continued, "And yet, after it was really laid out, what a pathological liar she is and how much she has lied and lied and lied throughout the investigation, now three weeks into it, I wonder that if she takes the stand, will the jury believe her? I don't think so. Will they punish her or will it be backlash if she takes the stand and says things which they perceive as lies? Will they now actually go for the harsher first-degree murder charge, instead [of] the possible aggravated manslaughter of a child?"

"Early Show" co-anchor Rebecca Jarvis asked if not taking the stand could negatively influence the jury's perception of Anthony.

Jordan said a lot of people think someone is guiltier if they don't take the stand. However, she said in cases like these, jurors qualify for selection partially because they say they wouldn't hold it against her if she didn't take the stand.

"In 99 percent of cases, the defendant in trials like this, the defendant doesn't take the stand. Legally they don't have to, and very often it can come back to haunt them," she said. "'Don't put a face to the charges' is usually what most defense attorneys would advise."

The trial - in day 22 - resumes today.