Here。。。不认也没办法

•  If cooperative and there’s no suspicion of a crime, you’re likely released with a warning or citation. If the officer can’t verify your identity and suspects wrongdoing, they may detain you briefly (California Penal Code 647(e) allows detention for “reasonable suspicion” of loitering with intent to commit a crime).
• Refusal to identify isn’t a crime in itself, but it could escalate if the officer believes you’re obstructing (Penal Code 148), though this is rare if you’re polite.