N.H. Rev. Stat. Ann. § 651-D:3
II. The investigating agency may, however, petition the court to destroy or otherwise dispose of biological material after 5 years even if a person connected with the case is still in custody. If the investigating agency petitions the court to destroy evidence before the person is released from custody, the investigating agency must serve a copy of the petition to destroy biological evidence on the person who remains in custody, any counsel of record, and the prosecuting agency. The investigating agency may destroy biological material 90 days after filing a petition, unless the investigating agency receives:
Source. 2004, 239:1, eff. June 15, 2004.