Don't confuse constitutional law under the 4th amendment with the California statute regarding recording someone without their permission. The 4th amendment applies to governments, not individuals, to prevent the use in a criminal proceeding, or quasi-criminal proceeding (like an administrative matter)of evidence obtained in violation of the 4th amendment. Individuals, however, can obtain information any number of ways and it is not a violation of the 4th amendment, and it may later be used in a court proceeding for civil or criminal matters.
However, this statute creates a privacy right in California to not be recorded without your knowledge or consent. The law prohibits the use of such a recording in any civil or criminal proceeding. It's a little different situation than your standard 4th amendment case.
I’m in California and was referencing our lawz...