Orlando, Florida (CNN) -- In a rare display of courtroom ire, the usually even-keeled judge in the Casey Anthony case admonished lawyers for both sides to lower their voices and conduct themselves in a more professional manner.
"Enough is enough, folks," Chief Judge Belvin Perry Jr. told the bickering lawyers. "I've had enough of the back and forth between the two of you."
He threatened to charge them $100 -- and donate it to United Way -- in the event of any further breach of courtroom decorum.
"I don't have a hearing problem -- as of yet," he said. "I can hear normal voices. And I look for a certain level of professionalism. I don't look for loud shouting."
He urged them to keep their editorial comments to themselves, not to interrupt one another and to rise when making any objection.
"You're supposed to be seasoned trial lawyers," Perry said. "This is not the two of you's first rodeo. You've been in court before and enough is enough. So, if you continue it, I'll do what I need to do."
Perry's remarks came after defense lawyer Jose Baez and Assistant State Attorney Jeff Ashton sparred over what scientific evidence should be allowed at Anthony's murder trial.
Anthony, 25, faces a capital murder charge in the death of her 2-year-old daughter, Caylee. The girl was reporting missing in July 2008, and investigators found her body after five months of searching.
The defense has been trying to get some expert scientific testimony excluded, such as an expert's assertion that chloroform was found in the carpet and in air samples from the trunk of the car that Anthony was driving before her daughter disappeared.
The prosecution contends that Anthony used "a substance" to kill her daughter. Chloroform is a substance that can be fatal.
Also Friday, Anthony's mother, Cindy Anthony, testified about the odor from the trunk of her daughter's car that she said smelled like a dead body. The defense said that the smell could have emanated from garbage in the trunk.
Jury selection is to begin May 9.
In Session's Jean Casarez and Nancy Leung contributed to this report