An important clue which MUST be known by the medical examiner/police is whether the garrotte was what strangled JB. If the garrote did not cause the strangulation marks then the situation was DEFINITELY staged (strongly implicating the parents). If the garrote did cause the strangulation then the sex scene seems real. Shouldn't the ME be able to tell if the strangulation marks where likely caused by the garrote or not? Maybe I've been watching too much CSI but it seems like they should be able to tell the size/type of strangulation material. Does the John Karr arrest signal that they know the garrote really did cause the strangulation marks?