Legal Question in Administrative Law in California

To be safe, a POA or other such legal documents should be properly 'formed' in the state where they will be put to use. You need to check AZ law about notarization or witness requirements.

Recognition of the validity of powers of attorney is somewhat erratic; I have heard reports of difficulty getting out-of-state POAs accepted as genuine and in full force and effect. With ordinary civil POAs for real-estate transactions, etc., I often advise clients to use a local form or to check with the folks who'll be called upon to recognize the validity of the POA in advance (when possible). These troubles were supposedly addressed by the adoption of supposedly uniform interstate forms several years ago, I believe in 1999 in California for health care POAs.

Officially, California law requires recognition of advance health care directives executed in other states. See Probate Code section 4676 (probably easily found on line via a Google or Bing search). I would guess that other states (e.g., Arizona) have similar laws making health care directives executed in California valid and enforceable there ...... but as a California licensed lawyer, I cannot assure you what's in another state's laws.

I'd suggest search terms "Section 2(h)" "Uniform Health-Care Decisions Act" and "Arizona" as possible keys to seeing what Arizona law contains on this subject.