Section 939 Of Article 4. Conduct Of Investigations From California Penal Code >> Title 4. >> Part 2. >> Chapter 3. >> Article 4.
939
. No person other than those specified in Article 3 (commencing
with Section 934), and in Sections 939.1, 939.11, and 939.21, and the
officer having custody of a prisoner witness while the prisoner is
testifying, is permitted to be present during the criminal sessions
of the grand jury except the members and witnesses actually under
examination. Members of the grand jury who have been excused pursuant
to Section 939.5 shall not be present during any part of these
proceedings. No persons other than grand jurors shall be permitted to
be present during the expression of the opinions of the grand
jurors, or the giving of their votes, on any criminal or civil matter
before them.