N.H. Rev. Stat. Ann. § 328-J:22
Persons who have been engaged in the practice of medical imaging or radiation therapy, other than a radiologist assistant, who do not hold a current certification and registration from a certification organization approved by the board may continue to practice in the modality of medical imaging or radiation therapy in which they are currently employed provided that they:
Source. 2016, 54:2, eff. July 1, 2016. 2017, 11:2, eff. Apr. 17, 2017.