i did something very similar to this in 1998 at high school, good times
Good times they were not, though. As a kid who didn't have bad intentions, dealing with the repercussions was a lot.
There was no precedent (at my school, at that time) for how to prevent and deal with a situation like that, though.
In-school suspension and police interrogation for me on different occasions. In each, I had actually done nothing but was smart and could have done something. The first was actually a setup by the most notorious hacker in the school who I was showing up a bit with my demos. He had some script downloading and popping up porn on my computer that a teacher saw while I was at lunch. Looking at the times, it added new files to IE cache every 15-30 minutes all the way into the 2-3AM's. My defense was I couldn't possibly be in class surfing porn after the school closed. The non-technical authorities had made up their mind someone would be punished, though. ;)
I had the experience in high school in the 90's of being wrongly accused of computer mischief solely on the grounds that I might be capable of such. I was astounded that merely possessing knowledge would be sufficient for such an accusation. Thankfully, no suspensions or police involvement came out of it.