Nevada
No person shall perform any tattoo procedure whatsoever upon a person under the age of fourteen (14) years, unless under the supervision of a medical professional. Tattoo procedures performed upon a person under the age of eighteen (18) years require the written consent and proper identification of a parent or guardian unless the person has been emancipated by a court of competent jurisdiction and can provide legal documentation stating this fact. Any tattoos performed on a minor must be done in the presence of a parent or guardian.
Read more about this topic: Legal Status Of Tattooing In The United States