N.J. Stat. Ann. § 2A:168-9

In case of the absence or disqualification of any probation officer for any cause, the Assignment Judge of the Superior Court may appoint some other person to serve temporarily as a probation officer, who shall receive as compensation for each day's service a sum determined by the court. The compensation so paid for any excess over 90 days' absence of any probation officer in any one year may be deducted from the salary of such probation officer.