25 U.S.C. § 1665e

1. (a)Subject to section 1621t of this title, and except as provided in subsection (b), any individual employed as a psychologist, social worker, or marriage and family therapist for the purpose of providing mental health care services to Indians in a clinical setting under this chapter is required to be licensed as a psychologist, social worker, or marriage and family therapist, respectively.
2. (b)An individual may be employed as a trainee in psychology, social work, or marriage and family therapy to provide mental health care services described in subsection (a) if such individual—
   1. (1)works under the direct supervision of a licensed psychologist, social worker, or marriage and family therapist, respectively;
   2. (2)is enrolled in or has completed at least 2 years of course work at a post-secondary, accredited education program for psychology, social work, marriage and family therapy, or counseling; and
   3. (3)meets such other training, supervision, and quality review requirements as the Secretary may establish.