If he objects to the legal sufficiency of the accusation, the objection must be in writing, but need not be in any specific form, it being sufficient if it presents intelligibly the grounds of the objection.
Idaho Code § 19-4106
Form of demurrer
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.