RSA 31:126: Presumption of Procedural Validity.

Municipal legislation, after 5 years following its enactment, shall, without further curative act of the legislature, be entitled to a conclusive presumption of compliance with statutory enactment procedure. Any claim that municipal legislation is invalid for failure to follow statutory enactment procedure, whether that claim is asserted as part of a cause of action or as a defense to any action, may be asserted within 5 years of the enactment of the legislation and not afterward.