Day 24 of the Casey Anthony murder trial extended to nearly 6 p.m. as lead defense attorney Jose Baez tried to get a research chemist to discredit a colleague who had testified for the state.

The defense called Dr. Marcus Wise, a research scientist at Oak Ridge National Laboratory specializing in analytical chemistry.

Wise?s questioning became increasingly heated as Baez question research methods used at the laboratory.

Wise is a colleague of Dr. Arpad Vass, who was called as a state witness to testify about the smell of human decomposition and high levels of chloroform found in air samples taken from the trunk of Anthony?s car.

Baez questioned Wise about Vass? qualifications, as well as whether the researchers or laboratory would benefit financially if technology they created to detect decomposition in air samples was successfully used in court.

Wise said the device, called a labrador, was designed for use by law enforcement and the military, and he would earn no royalties from its use. He said the labrador was only in the development phase when the Oakridge National Laboratory was performing tests on samples in the Anthony case.

Wise testified that the presence of chloroform in Anthony's trunk is unusual and he could not confirm it was the product of common products.

Anthony's murder trial resumed Tuesday morning with a forensic botanist being called to the stand a day after the judge abruptly called for an early recess.

Day 24 began with attorneys from both sides arguing whether a defense witness would be able to testify about DNA in the case. Judge Belvin Perry ruled that the witness would not be able to testify about the DNA of decomposition fluid in the trunk of Anthony's car. Perry, however, said he would be willing to hold a hearing later and revisit the issue.

The defense, for the first time since Saturday, then called a witness to testify. Jennifer Welch, an Orange County sheriff's crime scene investigator, was called back to the stand and questioned by defense attorney Dorothy Clay Sims.

"Did you take photographs of the scene (where Caylee's body was found in 2008) after the vegetation had been cleared?" Clay Sims asked.

"Yes," said Welch, identifying a photo of the cleared scene.

Some photos were placed into evidence and shown to the jury before the witness was cross-examined by state prosecutor Jeff Ashton, who asked Welch if she could identify exactly where the remains were based on one of the photos.

Welch said she could not without looking at her library of photographs of the scene.

After being asked about catalog numbers of the photos during re-direct by Clay Sims, Welch was excused.

The defense then called Dr. Jane Bock, a forensic botanist, to the stand.

"I have looked at photographs taken by the medical examiner and the Sheriff's Office crime scene investigators and visited the recovery area and read documents about the case," Bock said.

Bock told jurors that she believed the roots could have grown through the bones, skull and a laundry bag in two weeks. Prosecutors have said Caylee's remains had been in the woods near the Anthony family home since the summer of 2008.

While pointing to a photograph in front of the jury, Ashton asked Bock if she measured the amount of "leaf litter" in a certain area.

"No. Did anyone else?" Bock said.

"The neat thing about this is that you don't get to ask me any questions," Ashton joked.

Ashton pointed out that Bock said in her deposition that she couldn't say when Caylee's remains were placed in the woods. Bock then admitted that it's possible that Caylee's remains were in the woods for more than two weeks.

Ashton also said that Caylee's hip bone was found buried in 4 inches of muck, implying that Caylee's skull was likely in the woods for longer than two weeks. Bock suggested a dog or another animal could have buried the hip bone.

The defense then called DNA expert Dr. Richard Eikelenboom.

Ashton said Eikelenboom originally only submitted a half-page summary of his findings that contained no significant opinion, but now wants to present two written pages and 45 PowerPoint slides to jurors, which Ashton says is a clear violation of Perry's court order for all expert witnesses to submit detailed reports.