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I wonder if it's true that Albert "handled the spanking." This is how I was raised (the "wait until your father gets home model") and nearly everyone I knew was raised the same way. Among my students, it's still a common model. Spanking is a way of physically abusing a child without leaving marks in visible places. At any rate, both parents need to be carefully interviewed and I expect that they have been. There's probably a whole other story the police know, other than the one we know, as we are getting most of it from LS.
As this case goes along, I expect LS to continue to maintain her innocence and to open full throttle on blaming Albert as much as possible. If there were to be found injuries on Gannon's body, she will likely blame Albert (who was perhaps riled up by LS implying that Gannon set the house on fire; MOO). In fact, I assume the reason DA May went to the house was to inspect the degree of damage (at least that's one reason), which helps him assess LS's truthfulness as a witness and the seriousness of the situation Gannon might be in. Since LS insists he ran away (will she now insist he ran away from a parked car?), the DA has to assess the value of that statement, can't just ignore it.