Impossible. So, evidence that they agreed as to what to say about that night. All you need is for each one to say, "I slept through the night and heard nothing unusual."
Yeah. Steve Thomas called them on it one time - maybe in their confrontation on LKL or maybe in a police interview, I've forgotten which now.
John was vouching for Patsy being asleep all night - and Steve said, "How would you know? You were asleep."