Absolutely! A couple of years ago...well about five, before the principal at my then new school really knew he had a pro-gun conservative in his liberal playground, I snuck this one in to my American History class as a "WHAT IF" critical thinking exercise.
All the freeper advice here is golden, I can't imagine adding anything to it, except to echo what Travis McGee said about raising Holy you-know-what about BOWLING FOR COLOMBINE, and demand equal time or a lawsuit for the JPFO movie.
Trust me, nothing scares a school board more than the threat of legal action, especially over something small like a movie. At the very least, the board will deny the school the right to show Moore's garbage, which is almost as good.