Audio cannot be recorded without consent in CA. Security cameras have an option to disable audio for this reason. People never do it but it's the case.
It's related to wiretapping laws that are very broad.
> For the purposes of this section, “confidential communication” means any communication carried on in circumstances as may reasonably indicate that any party to the communication desires it to be confined to the parties thereto, but excludes a communication made in a public gathering or in any legislative, judicial, executive, or administrative proceeding open to the public, or in any other circumstance in which the parties to the communication may reasonably expect that the communication may be overheard or recorded.
Did you read that law? It applies to “Confidential communication…carried on among the parties in the presence of one another or by means of a telegraph, telephone, or other device, except a radio”. Conversation in public is by nature not “confidential”. You are grossly misinterpreting this law and (unintentionally/ignorantly) spreading misinformation.
If there is a big obvious security camera staring at you, in a public place, that is the opposite of an expectation of privacy.