You are correct that California is a two-party consent state. I will answer your questions in the order that they were presented:
1. You can make a complaint to law enforcment; whether they elect to act on it is an entirely different story. You will almost certainly need physical evidence before they even begin to consider forwarding a criminal complaint
to the District Attorney.
2. As for getting the document produced, if you are already involved in litigation
, you can absolutely request that the recordings be produced. I would recommend that you serve the other attorney with a "request for production". If you are not involved in litigation, California provides a civil remedy for an illegal recording that you may wish to pursue. Review California Penal Code Section 637.2, which allows for civil recovery of $5,000+. You could consider suing the recorder civilly, then request production under that suit.
3. The recording is generally not admissible in court. However, it may be used to impeach testimony
if the recorded party makes a statement under oath that is inconsistent with the recorded statement.
I should also bring to your attention that if an attorney has "threatened" to use the recording against you, they may have committed extortion
. See California Penal Code Sections 518-527. If you find that the attorney has, I would bring this to his attention and consider contacting the state bar association.
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