N.J. Stat. § 19:15-25
In all municipalities after the district board shall have ascertained that a voter is properly registered and qualified to vote the inspector of election shall furnish to the voter one official ballot numbered to correspond with the poll number of the voter, allowing for spoiled ballots, if any.
No ballot shall be handed to a voter until there is a booth ready for occupancy. The members of the district board shall not allow a voter to mark his ballot outside of an election booth unless the voter is unable to enter the booth by reason of his physical disability.
The inspector shall instruct the voter how to fold the ballot and shall crease the ballot so as to indicate the point where the voter shall fold the ballot, but before handing the ballot to the voter the inspector shall see that the face of the ballot including the coupon is exposed, and at the same time shall call off the ballot number to the member having charge of the polling book, who shall make certain that the ballot number and poll number agree, allowing for spoiled ballots, if any.
If the number of the ballot does not follow consecutively the missing number or numbers shall be written on a blank sheet of paper signed by the members of the district board and placed on the string with the coupons in its or their proper place or places.
N.J.S. § 19:15-25