N.H. Rev. Stat. Ann. § 29-A:1

It is the intent of this chapter to protect county officers, trustees, officials and employees who are subject to claims and civil actions arising from acts committed within the scope of their official duty while in the course of their employment for the county. It is not intended to create a new remedy for injured persons, nor to waive the sovereign immunity of the county which is extended by law to county officers, trustees, officials and employees. The doctrine of sovereign immunity of the state, extended to the counties by law, and the extension of that doctrine to officers, trustees, officials or employees of the county or any agency thereof acting within the scope of official duty and not in a wanton or reckless manner, except as otherwise provided by statute, is hereby adopted as the law of the state.