Okla. Stat. tit. 12, § 12-2701: Opinion testimony by lay witnesses

If the witness is not testifying as an expert, the witness’s

testimony in the form of opinions or inferences is limited to those

opinions or inferences which are:

1. Rationally based on the perception of the witness;

2. Helpful to a clear understanding of his testimony or the

determination of a fact in issue; and

3. Not based on scientific, technical or other specialized

knowledge within the scope of Section 2702 of this title.