Cal. Bus. & Prof. Code § 3537.25

Both the pilot and the ongoing training program shall provide training at no cost to the participants in return for a written, enforceable agreement by the participants to, upon obtaining licensure under this article, serve a minimum of four years as a full-time physician assistant in an area of California designated by the Office of Statewide Health Planning and Development as a medically underserved area pursuant to Section 3537.35.