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Several witnesses have already testified that accused murderer Casey Anthony’s trunk smelled of a decomposing body, but according to an expert, the evidence is inconclusive.

Dr. Michael Sigman, a chemistry professor at the University of Central Florida, testified Wednesday that the trunk of Casey’s Pontiac Sunfire showed tracess of gasoline, chloroform and other chemicals. Those chemicals are associated with human decomposition, but they are also linked to onions, cabbages and Chlorox. The doctor testified that the compounds “gave very low responses”.

He told the defense attorney, “I cannot conclusively determine that there had been human remains in the trunk of the car.”

People magazine has more:

Prosecutors in the murder trial in Orlando had called several experts who concluded that based on the air samples, a strand of hair, insect activity and the reaction of cadaver dogs that a body was in fact in the Florida mom’s car.

Casey, 25, who faces the death penalty if convicted in her 2-year-old daughter Caylee’s death, busily passed notes to her lawyers throughout the morning’s testimony.

Among several other witnesses who took the stand was Madeline Montgomery, a forensic toxicologist for the FBI.

She testified that she found no evidence of drugs – including calming medications Xanax and Valium – in hair presumed to be Caylee’s. But she also acknowledged she could not test the hair for chloroform.

Stay tuned as more details are unraveled about the case. We are curious to know if Casey will take the stand in her own defense. What do you think?

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