In a challenge for implied bias, one or more of the legal causes must be alleged. In a challenge for actual bias, it must be alleged that the juror is biased against the party challenged. In either case the challenge may be oral, but must be entered on the minutes of the court.
Idaho Code § 19-2022
Challenge for bias — How stated
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.