Now that you mention it, I seem to remember hearing something about throwing stars being illegal in The States, or at least NY state, or maybe just this particular town where the incident happened. A teacher confiscated a throwing star from a student, felt obligated to report to the main office, the legality issue came up, and the student was escorted from the building in handcuffs by the police.
EDIT: ran a quick search looking for cheap throwing knives (I don't care enough to search the legal issue) and found
J & L, Knives, Throwing Knives