N.H. Rev. Stat. § 281-A:33
Any employer who is liable for the compensation provided by any or all of RSA 281-A:26, 28, 31, or 32 shall, upon being found in violation of any provision of either or both RSA 277 and RSA 276-A, insofar as the latter chapter deals with prohibiting hazardous occupations for youth, and if there is recorded in the department a prior violation of the same kind or if the employer has failed to comply with written departmental recommendations applicable to a first violation within the reasonable period allowed, become liable for twice the amount of such compensation; provided, however, that if payment of compensation is secured pursuant to RSA 281-A:5, I, an employer and employer's insurance carrier shall share equally the payment of compensation under this section.
RSA 281-A:33
1988, 194:2, eff. July 1, 1989.