Same here, mete. I have always carried a knife since I was about 10 years old. I carried a tactical folder to school every day. One day, when drug dogs were sniffing about in our highschool classroom on a random search (a 2-3 times a week event where I went to school...small town, bad drugs), I had left my pocket knife in my jacket, and as the dog brushed by, it rattled out onto the ground. The police officer says, "who's is this?" and I said, "it's mine." She then proceedes to tell me how I have a weapon at school and I'm in trouble. I told her that it is perfectly legal according to the school code of conduct which states you couldn't carry an illegal pocket knife. My knife is perfectly legal (4" blade...she didn't even know the legal length limit until I told her), and besides, people have been killing each other with rocks and sticks long before the knife was ever around. She said I had to take it up with my principal, so I grabbed my student handbook and didn't have a problem. He just suggested I not bring it back, so I didn't. I just brought a little bit larger one the next day!
--nathan