S.C. Code § 40-55-70
It shall be unlawful for any person not licensed under this chapter to present himself or be presented to the public by any title incorporating the name "psychologist," "psychological," or "psychology," except that any psychological scientist employed by a recognized research laboratory, school, college, university, or governmental agency may represent himself by the academic or research title conferred by the administration of such firm, institution or agency; and except that a person may represent himself or have himself represented as a psychologist, providing he is a member of the American Psychological Association or of a regional association affiliated therewith or is eligible for such membership. Provided, nothing in this section shall be construed as permitting such persons to offer their services to the public or to accept remuneration for psychological services rendered to persons or organizations other than those firms, institutions or agencies from which they receive their salaries unless they have been licensed under this chapter. Provided, further, psychologists may receive fees for lectures presented outside their regular employment setting without being licensed.
Visiting lecturers from other states may also employ their academic or research titles or the designation "psychologist" providing that they are members of or eligible for membership in professional associations as stated in this section. Students of psychology, psychology interns and other persons preparing for the profession of psychologist in recognized training institutions or facilities may be designated by titles such as "psychological trainee," "psychological intern," and other terms clearly indicating their training status. Psychologically trained individuals who do not meet requirements for licensing as provided in Section 40-55-80 are permitted to render psychological services when under the direct supervision of a licensed psychologist who assumes professional responsibility for the competence of services rendered and who keeps the board informed of the nature and extent of such services under his supervision.
S.C. Code § 40-55-70