High school students what self-defense weapon is the best and does not belong to the scope of control props

Throwing stick (medium and long distance, easy to confiscate) nunchaku (near and far, but also a threat to themselves, do not explain) police T-bar (near and far, but also can tackle, you can give the police said is a self-defense stick 。。。。) Wushu double crutch (near and far, will not be confiscated by the police, said martial arts supplies or sporting goods) tactical pen (close range, encountered with a knife no solution) finger tiger (the same tactical pen) I personally Taobao bought a pair of Wushu double crutch, but also gift double crutch tutorial