Cal. Prob. Code § 4307

(a) A copy of a power of attorney certified under this section has the same force and effect as the original power of attorney.
(b) A copy of a power of attorney may be certified by any of the following:
1. (1) An attorney authorized to practice law in this state.
2. (2) A notary public in this state.
3. (3) An official of a state or of a political subdivision who is authorized to make certifications.
(c) The certification shall state that the certifying person has examined the original power of attorney and the copy and that the copy is a true and correct copy of the original power of attorney.
(d) Nothing in this section is intended to create an implication that a third person may be liable for acting in good faith reliance on a copy of a power of attorney that has not been certified under this section.