If the police, for any reason, suspect you of carrying a weapon, they can search you. Due to a section of the weapons legislation in my state, anything carried with the intent of it being used as a weapon is a dangerous article.
Batons are regulated, the comtech stinger is prohibited both at an import and state carry level, and due to recent events in my city, police are zero tolerance on knives. I have consulted with a lawyer, various lecturers at my university (a security and pre police force and intelligence training institute) and been over both my state laws, regulations and the federal customs act.