Ohio Rev. Code § 4732.21: Prohibiting unlicensed practice.

Except as provided in section 4732.22 of the Revised Code:

(A) No person who is not a licensed psychologist shall offer or render services as a psychologist or otherwise engage in the practice of psychology.

(B) No person who is not a licensed psychologist, licensed independent school psychologist, or licensed school psychologist shall offer or render services as a school psychologist or otherwise engage in the practice of school psychology.