We know Tommy Skakel lied, because he, admittedly, altered his story to now include highly relevant facts he purposefully concealed from the Greenwich Police Department, Dr. (Stanley) Lesse, and others.

CNN: Moxley Case: Excerpts from the Sutton Report

Certain individuals are capable of such deception. (If the perpetrator is in some state of denial, for example, their responses may not register on the polygraph.) Tommy, we know, successfully lied to Dr. Lesse.

CNN: Moxley Case: Excerpts from the Sutton Report

For example, he told the Greenwich Police and Dr. Lesse that the last time he saw Martha Moxley on the night of her murder was at the side of his house, around 9:30 pm.

CNN: Moxley Case: Excerpts from the Sutton Report