Schools keep attendance records that show what students were in school each and every day and what students weren't in school each day. I would guess that LE was bright enough to check the attendance records for Haleigh. They know whether she was in school that day or not. I doubt that they are concerned whether we know if she was there or not. That is why they don't send out a memo to the public each day telling us what they are doing. They don't owe us anything and have their own detectives working the case.
IMHO..They best be concerned IF she wasn't there because IF she wasn't there something is terribly wrong with HOW their OWN detectives are working this case...JMO