What you paint Joanna is a conspiracy involving 1 school teacher, 1 school administrator a judge and (in your comment below) the police. While I am not saying it absolutely did not happen, it is highly unlikely. In the article you posted a link to there was in fact photographic evidence but the faces of the perp's were not shown. This fact is much more likely to the the cause of the problem. 

Please don't think this in anyway diminishes how serious this problem is, it does not. While it might be that 1 person, or perhaps 2 might try to hide something like this, it is ultra hard to believe that 4 (or more) who dedicate their lives to protecting people would be complicit.