Okla. Stat. tit. 15, § 15-219A: Noncompetition agreements

A. A person who makes an agreement with an employer, whether in

writing or verbally, not to compete with the employer after the

employment relationship has been terminated, shall be permitted to

engage in the same business as that conducted by the former employer

or in a similar business as that conducted by the former employer as

long as the former employee does not directly solicit the sale of

goods, services or a combination of goods and services from the

established customers of the former employer.

B. Any provision in a contract between an employer and an

employee in conflict with the provisions of this section shall be

void and unenforceable.