Well, NJ is the state that criminalizes certain types of slingshots so... enter at your own risk!
"Under state law, manufacturing, transporting or possessing a slingshot without "an explainable, lawful purpose" is a fourth-degree crime, punishable by up to 18 months in prison and a fine of up to $10,000."
http://www.nj.com/politics/index.ssf..._decrimin.html