Cal. Rev. & Tax. Code § 19546

Upon request of a committee appointed by either the Assembly or the Senate, or both, any information may be furnished to the committee, but it is a misdemeanor for the committee or any member, clerk, or other officer or employee thereof to disclose in any manner any particulars of the information so furnished except to law enforcement officers for the purpose of aiding the detection or prosecution of crimes committed in violation of this part.