South Dakota Codified Laws
Chapter 10 - Offenses By And Against Minors
Section 26-10-19 - Tattooing minor without parental consent as misdemeanor.

26-10-19. Tattooing minor without parental consent as misdemeanor.
No minor may be tattooed unless the minor's parents have signed a consent form authorizing the tattoo. Any person who tattoos a minor without parental consent is guilty of a Class 2 misdemeanor. The term "tattoo" means to make permanent marks or designs on the skin by puncturing it and inserting indelible colors.

Source: SL 1985, ch 216, ยงยง1, 2.