N.H. Rev. Stat. Ann. § 593:2

Any officer or keeper of a prison or other place of detention, having in custody any prisoner, suspicious person or lodger, may, if deemed advisable, measure and describe, or cause such person to be measured and described, in accordance with the system commonly known as the Bertillon method for identification, and in addition may take such photographs as are deemed necessary and also may take copies of the fingerprints of such person in accordance with the fingerprint system for identification.