Cadaver dogs led detectives to believe there were signs of decomposition in the trunk of Casey Anthony's vehicle and hit on two spots in the child's grandparents home early in the search for the missing girl.

The lab apparently testing the air samples, called The Body Farm, is run by the school's anthropology department.

A researcher at The Body Farm has developed an artificial nose of sorts that can sniff out evidence of human decomposition and decay.

It works by recognizing compounds found in the air where decomposition occurs.

Detectives won't confirm where the samples were transported to, but they said the air samples are being tested for decomposition.

Another Visit Rejected

Also over the weekend, Casey Anthony turned down another Orange County jail visit from her parents.

Casey Anthony's mother, Cindy, said she was not sure why Casey canceled a visit.

"I'd like to see her but if she doesn't want to see us, that is her prerogative," Cindy Anthony said. "I'm sure she had her reasons. You always want to see your child but then again, I'm sure she had her reasons."

A national search for Caylee continues.

Watch Local 6 News for more on this developing story.