N.J. Stat. § 54:3-9
Each county tax administrator hereafter appointed who shall have received two consecutive appointments for full terms as county tax administrator, and each county tax administrator serving a full term as secretary on the effective date of this amendatory and supplementary act who shall thereafter be appointed to another consecutive full term as county tax administrator, and each county tax administrator who has heretofore acquired tenure as secretary pursuant to this section shall hold office as county tax administrator during good behavior and efficiency, and shall not be removed for political reasons or for any cause other than incapacity, misconduct, or disobedience of just rules or regulations established by the Director of the Division of Taxation.
For the purposes of this section any person holding the position of county board secretary on the effective date hereof shall be considered to be serving a full term as secretary if he was appointed to serve a full term of 3 years or 5 years, as the case may be, or to serve more than 2 years of an unexpired term.
N.J.S. § 54:3-9