And another thing....if Patsy and JR were so effective at coaching Burke to not say the wrong thing, why didn't they coach him about acting cool under interrogation. I mean wouldn't that have been important. By smiling and acting "weird" as people say, he is giving himself away. They had enough foresight to get dna, write a letter, stage a vilolent murder and even convince burke to never speak of the night in a way that would implicate them, but not enough foresight to coach him to act normal and not raise suspicion. Seems like a pretty big mistake for people who were capable of carrying out such a flawless coverup.