Cal. Bus. & Prof. Code § 2912
(a) Notwithstanding Section 2903, a person who holds a license in another jurisdiction of the United States or in Canada as a psychologist may provide psychological services in this state for a period not to exceed 30 consecutive days in any calendar year, if all of the following conditions are met:
(b) A person who intends to provide psychological services pursuant to this section shall provide the board with all of the following before providing services: