S.D. Codified Laws § 36-10-35.8
A physical therapist may not, at any one time, supervise more than the equivalent of two full-time physical therapist assistants. The supervising physical therapist shall register, with the State Board of Physical Therapy, the name and address of each physical therapist assistant whom the physical therapist is supervising. The registration must be on a form provided by the board, and submitted at least fifteen days prior to the date on which supervision is to commence.
The supervising physical therapist shall, within ten days of termination, provide written notification to the board, if the supervision of a physical therapist assistant is terminated. The supervising physical therapist may delegate responsibility for the supervision of a physical therapist assistant to another physical therapist, for a period not exceeding thirty days.
SDCL 36-10-35.8