Okla. Stat. tit. 12, § 12-2702: Testimony by experts

If scientific, technical, or other specialized knowledge will

assist the trier of fact to understand the evidence or to determine

a fact in issue, a witness qualified as an expert by knowledge,

skill, experience, training, or education may testify in the form of

an opinion or otherwise, if the proponent demonstrates to the court

that it is more likely than not that:

1. The expert’s scientific, technical, or other specialized

knowledge will help the trier of fact to understand the evidence or

to determine a fact in issue;

2. The testimony is based upon sufficient facts or data;

3. The testimony is the product of reliable principles and

methods; and

4. The expert’s opinion reflects a reliable application of the

principles and methods to the facts of the case.