Laws governing the carriage of hidden blades differ by state and circumstances, according to FindLaw. States typically prohibit people from carrying bladed weapons that exceed a certain length. In California, cane swords constitute a misdemeanor since people must wear swords and other weapons with fixed blades in plain view.
In New York, a person carrying a walking stick with a hidden blade may be charged with a misdemeanor, which can become a felony if it is his second or third offense, states FindLaw. Federal law prohibits carrying bladed weapons in public, but people may carry swords with their checked luggage. Carrying sabres, foils and other weapons that resemble swords is only legal in specific circumstances.