Casey Anthony’s parents agree to undergo polygraph tests on-camera to answer lingering questions about George’s involvement in Caylee’s death in this bonus scene from the new special, Casey Anthony’s Parents: The Lie Detector Test. | Crime & Investigation on A&E

Casey Anthony’s parents face the ultimate test during the new special, Casey Anthony's Parents: The Lie Detector Test, premiering Thursday, January 4th at 9/8c on A&E. | Crime & Investigation on A&E

In an exclusive two-hour special, Casey Anthony’s parents take an on-camera polygraph test and share their story to give their final say on the events surrounding heir granddaughters death. Casey Anthony's Parents: The Lie Detector Test premieres January 4th at 9/8c on A&E. | A&E