N.H. Rev. Stat. Ann. § 262:35
No custodian shall be liable for damages to such vehicle while it is in his or her custody, providing due care is exercised to prevent negligent acts.
Source. 1931, 83:1. RL 121:2. RSA 266:2. 1981, 146:1; 361:1, 3. 2010, 344:3, eff. Sept. 18, 2010.