California CodesPenal CodePart 2 - OF CRIMINAL PROCEDURETitle 4 - GRAND JURY PROCEEDINGSChapter 3 - Powers and Duties of Grand JuryArticle 4 - Conduct of Investigations§ 939.4§ 939.4Added by Stats. 1959, Ch. 501.The foreman may administer an oath to any witness appearing before the grand jury.Cite this sectionCal. Pen. Code § 939.4 (2026)Copyhttps://ca.codecond.com/codes/pen/part-2-of-criminal-procedure/title-4-grand-jury-proceedings/chapter-3-powers-and-duties-of-grand-jury/article-4-conduct-of-investigations/section-939.4CopyOther sections in Article 4 - Conduct of Investigations§ 939§ 939.1§ 939.11§ 939.2§ 939.21§ 939.3§ 939.4§ 939.5§ 939.6§ 939.7§ 939.71§ 939.8§ 939.9§ 939.91← § 939.3§ 939.5 →