B.W.
Call a lawyer! Most of them will answer a question or two over the phone. All you really need to know at this point is weather or not there is a state law prohibiting you from seeing the tapes. That sounds stupid to me, but then we have a lot of stupid laws. Get the facts and then confront the bus company or principal or whoever will listen. You are not over-reacting. These are your kids. It's your job to protect them, and on the off chance they are doing something to instigate all this, wouldn't you want to know so you can teach them not to? Good luck!