A judge has been asked to rule that the knives that Sikhs carry for religious reasons do not violate the city\'s weapons laws. The case stems from the Aug. 14 arrest of a Wayne State University student for carrying a 10-inch knife, a kirpan, on his hip. A Detroit ordinance prohibits carrying knives with blades longer than 3 inches. Authorities dropped the charge against Sukhpreet Singh Garcha, but the American Civil Liberties Union and the group United Sikhs are pressing the claim that the campus arrest violated Garcha\'s religious rights.