Reply #6: It's illegal in California

[madmusic]

California's wiretapping law is a "two-party consent" law. California makes it a crime to record or eavesdrop on any confidential communication, including a private conversation or telephone call, without the consent of all parties to the conversation. See Cal. Penal Code § 632. The statute applies to "confidential communications" -- i.e., conversations in which the participants have an expectation of privacy. A California court has ruled that this statute applies to the use of hidden video cameras to record conversations as well. See California v. Gibbons, 215 Cal. App. 3d 1204 (1989). If you are operating in California, you should always get the consent of all parties before recording any conversation that common sense tells you might be "private" or "confidential." In addition to subjecting you to criminal prosecution, violating the California wiretapping law can expose you to a civil lawsuit for damages by an injured party. See Cal. Penal Code § 637.2.

http://www.citmedialaw.org/legal-guide/california/california-recording-law