This isn't so much a rule, but I strongly disagree with my school implementing iPads into our curriculum.
1. Give a bunch of bored teenagers a tablet, and what can you expect? Games, texting, and all under the teachers oblivious noses. They try to enforce it, but they're teaching a class, and if they had to periodically check every students iPad, it would take up a considerable amount of class time.
2. Excuses. No more "dog ate my homework" or lame stuff like that. The excuses the iPad brings to the table are viable, and unprovable. Since we're innocent until proven guilty, students can always blame the faulty book reading app or the worksheet that doesn't download.
3. The excuses above do actually happen from time to time. On an iPad, there are times when a book doesn't download, or a site doesn't work. Normal paper books can't have bugs or not download, so there's no excuse not to do work.
Rant over.
“In the course of twenty crowded years, one parts with many illusions. I did not wish to lose the early ones. Some memories are realities, and are better than anything that can ever happen again.” -Jim Burden (My Ántonia)