An FBI toxicologist said that hair samples from Caylee's skull did not test positive for xanax, valium, rufies and six other drugs. The hair was not tested for chloroform. The toxicologist acknowledged that testing hair is not the best way to see if someone was drugged.
Two other experts testified about a Gatorade bottle containing a syringe found in a red Disney bag near Caylee's remains. Caylee's skull was found on Dec. 11, 2008 in a wooded area near the Anthony family home.
The "cool blue" Gatorade bottle contained a "whitish, murky liquid," said Michael Rickenbach, a forensic chemist with the FBI.
Rickenbach said that the liquid seemed to be some type of cleaning solution and a mix of testosterone. He said that low levels of chloroform were present, but chloroform is often found in cleaning solutions. Its unclear what role the Gatorade bottle plays in the defense team's strategy.
Rickenbach also tested a car seat and steering wheel from Anthony's Pontiac Sunfire. Neither tested positive for chloroform, he said. A test of Caylee's favorite doll, found in the Pontiac Sunfire, tested positive for chloroform, but the levels were too low to be tested further, Rickenbach said.
The questions about the chloroform on the steering wheel and other objects appeared to suggest that if Casey Anthony had chloroform on her hands, it would have been on the steering wheel and other objects as well, but the judge blocked that line of questioning.
The continual focus on forensic evidence has done little to shed light on the defense's shocking opening statements that Caylee drowned and George Anthony, Casey Anthony's father, helped dispose of the body.
On Tuesday, the prosecution revealed that a one time jailhouse neighbor of Casey Anthony had come forward who had a story similar to Casey Anthony's defense.
April Whalen was assigned to a cell next to Casey Anthony for five days in 2009. Whalen's 15-month-old son, Isaiah, accidentally drowned in the family pool during a Christmas celebration in 2007. Whalen's father, Lynn Whalen, called 911.
Lynn Whalen told ABC News on Tuesday that he believed his daughter had talked to Casey Anthony while they were in jail together.