Not really sure of your question, if you meant why "doesn't your passport suffice"? It does, your passport can be used in lieu of you birth certificate.
- Provide proof of identity, such as a certified U.S. birth certificate, valid U.S. passport, employment authorization document, permanent resident card or foreign passport with an approved form I-94.
- Show a California residency document that includes your physical California resident address. Documents addressed to a PO Box must include the physical resident address on documents (for example utility bills).
- Present proof of your Social Security number, such as a SSN card, W-2 or paystub with your name and full SSN.


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