Are lawyer conversations with third parties relevant to a case privileged?
For example, imagine an attorney is defending a person against a criminal charge. The attorney interviews his client's roommate alone concerning matters relevant to the case and that conversation is recorded with consent of both parties. Later, the police interview the roommate and the roommate tells the police that he had a recorded conversation with the defendant's attorney. The police tell this to the the prosecutor. Can the prosecutor then subpoena the recording?
Here is another scenario: an attorney has a conversation with an expert witness pursuant to a criminal case before formally naming that expert witness as a witness (for example, before the trial starts or before his client has been indicted). Can that conversation be subpoened by the prosecution?