N.H. Rev. Stat. § 460:6
A married man or woman, whose wife or husband is insane, and has continued insane for one year, and who wishes to convey real estate, may apply by petition to the judge of probate for the county in which the real estate lies for a license to convey the real estate in such manner as to bar all rights which the insane wife or husband has in the real estate. A verified statement by a psychiatrist licensed as a physician in this state or by a psychologist licensed in this state shall accompany said petition and shall state that such psychiatrist or psychologist has personally examined the insane wife or husband and found such person to be incompetent to participate in such a conveyance.
RSA 460:6
CS 174:1. 1851, 1097:1. GS 164:18. GL 183:16. PS 176:6. 1915, 13:1. PL 288 :6. RL 340:6. RSA 460:6. 1975, 75:1. 1998, 234:15, eff. Oct. 31, 1998.