Section 3446 Of Chapter 3. Enforcement From California Family Law Code >> Division 8. >> Part 3. >> Chapter 3.

. (a) A court of this state may grant any relief normally available under the law of this state to enforce a registered child custody determination made by a court of another state.
  (b) A court of this state shall recognize and enforce, but may not modify, except in accordance with Chapter 2 (commencing with Section 3421), a registered child custody determination of a court of another state.