Casey Anthony's mother, Cindy, testified Thursday that she had used a computer at the family's Orlando home to do searches about chloroform.
Prosecutors contend that Casey Anthony searched about chloroform on the computer. Chloroform is a chemical compound that can be used to knock someone unconscious and it is also is found in human decomposition.
The body of Casey Anthony's daughter, Caylee, was found in December 2008, almost six months after she disappeared in Orlando. Casey Anthony is charged with first-degree murder and has pleaded not guilty. She faces the death penalty if convicted.