N.H. Rev. Stat. Ann. § 265-A:13

Any person who is dead, unconscious, or who is otherwise in a condition rendering him or her incapable of refusing shall be deemed not to have withdrawn the consent provided by RSA 265-A:4 and the test or tests may be administered. The provisions of RSA 265-A:8 shall not apply to persons incapable of giving consent as provided for in this section.