Ah, the good old OTT response.
You know full well that while, yes, a complete Faraday cage will block every signal completely, you don't need anything close to that to reduce reception down to the point of uselessness.
Our house isn't in a Faraday cage, but the signal we manage to get is so poor any teenager would be clawing at the door to he allowed up the hill for one bar, just one bar, that's all!
A few grounded conductive plates, otherwise known as magnetic whiteboards, strategically placed here and there around the school rooms, in line with the cell tower. HVAC positioned carefully, a nice wire mesh net to catch stray balls from that end of the playing field, all helps to reduce the data rate until the youngsters just give up in disgust.
Sure, there will be holes where signal can come in, but the outhouses are out of bounds anywayv(so being caught there is already a no-no) and the remainder are likely to be out in the open, where the security towers' searchlights can easily spot the miscreants. Although that last may not be applicable in this case, as I believe the US doesn't really have our notions of Public Schools. Well played, Tomkinson; and Perry Minor, report to the School Bully's rooms.
