Okla. Stat. tit. 59, § 59-540.8: Restrictions on the use of certain words and the letters

TRS/L or CTRS/L in connection with a name or business.

A. A licensed therapeutic recreation specialist may use the

letters TRS/L or CTRS/L in connection with his or her name or place

of business. CTRS/L is contingent upon maintenance of the National

Council for Therapeutic Recreation Certification (NCTRC) credential.

B. A person or business entity, its employees, agents, or

representatives shall not use in conjunction with that person's name

or the activity of the business the words therapeutic recreation

specialist, therapeutic recreation, recreational therapy,

recreational therapist, recreation therapist, the letters CTRS, TRS,

or TR, or any other words, abbreviations or insignia indicating or

implying directly or indirectly that therapeutic recreation is

provided or supplied, including the billing of services labeled as

therapeutic recreation, unless such services are provided under the

direction of a therapeutic recreation specialist licensed pursuant

to this act.