The parents of Casey Anthony took a lie detector test in a new A&E video on the disappearance and death of their granddaughter, Caylee Anthony.

For weeks, Casey Anthony sat at her murder trial with her defense team anxiously waiting for prosecutors to drop a bombshell: computer evidence, the state would argue, showing Anthony researched how to kill with poison and suffocation on the same afternoon her daughter, Caylee, was killed by poison and suffocation.