An indictment cannot be found without the concurrence of at least twelve (12) grand jurors. When so found it must be endorsed, a true bill, and the endorsement must be signed by the foreman of the grand jury.
Idaho Code § 19-1401
Indictment, how found
Current official text: Idaho Statutes (Idaho Legislature). Digitized from the UniCourt Code Improvement Commission public-domain capture. Reproduced from public-domain Idaho statutes; confirm against the official source for the current text. Not legal advice.