SDCL § 36-10B-2: Licensing and designation.

Except as provided in § 36-10B-15, no person may practice nutrition and dietetics or provide nutrition care services unless licensed or otherwise authorized to practice under this chapter. No person may practice as a licensed nutritionist, use the title nutritionist, dietitian, or licensed nutritionist, or use the abbreviation LN, unless licensed under this chapter. A licensed nutritionist may use the title licensed nutritionist and the abbreviation LN. A violation of this section is a Class 2 misdemeanor.

A dietitian registered by the Commission on Dietetic Registration may use the title registered dietitian and the designation RD.