SDCL § 19-19-701: Opinion testimony by lay witnesses.

If a witness is not testifying as an expert, testimony in the form of an opinion is limited to one that is:

(a) Rationally based on the witness's perception;

(b) Helpful to clearly understanding the witness's testimony or to determining a fact in issue; and

(c) Not based on scientific, technical, or other specialized knowledge within the scope of § 19-19-702.