I have heard of school boards banning books. I believe they even banned Webster's dictionary. There are a number of cases that have argued the constitutionality of this practice. I'm not sure what the connection is between this particular book and a kid carrying a knife. (I supposed kids at your school can't sing anything from West Side Story either.) If you think this isn't right, take it to your school board. The Outsiders is at least 40 years old. It was controversial then, but not now.