one last note on this: my kid was in high school, and we'd drop him off on the way to work. We'd sit and watch him go into the building. As soon as we left, he'd walk home and call himself in as sick (Hi, this is Mr Smith, Joe's dad...). Finally after a couple of weeks, a concerned teacher called to ask how he was doing, being so sick and all.
Ultimately he ended up at alternative school. Sometimes the parents actually do try to do the right thing, but our son is as oppositional as they come.
So I could see a kid scamming the system for a while, but not forever.