In New Jersey, mere possession of a slingshot is a 4th degree crime, with a maximum sentence of 18 months. In other words, a felony.
From the sponsor's statement to bill A3278, from 2016:
This bill amends the definition of a weapon to remove slingshots and decriminalizes the possession or manufacture of a slingshot in New Jersey.
Under current law, a slingshot is defined as a weapon. Additionally, two sections of law provide that possession of a slingshot is a crime of the fourth degree, unless the person has an explainable, lawful purpose for carrying the weapon. Another section of law provides that manufacture of a slingshot can be a fourth degree crime. Fourth degree crimes are punishable by a term of imprisonment of up to 18 months, a fine of up to $10,000, or both.
Shooting slingshots has long been a traditional and peaceable sporting activity, and one in which children often engage. Consequently, this bill amends the definition of weapon to remove slingshots. This change ensures that the burden to prove lawful conduct will no longer rest on a person who simply possesses a slingshot. The bill further provides that the manufacture of slingshots will no longer be considered a fourth degree crime.
That bill died in committee:
https://legiscan.com/NJ/bill/A3278/2016
