Idaho Code § 23-943A

It shall be a misdemeanor for any person to refuse to present identification indicating age, when requested by a peace officer of the state of Idaho when: (a) he or she shall possess, purchase, attempt to purchase or consume alcoholic liquor, as defined by section 23-105, Idaho Code; or (b) he or she shall possess, purchase, attempt to purchase or consume beer as defined by section 23-1001, Idaho Code; or (c) he or she is on a premises licensed to sell liquor by the drink at retail, or licensed to sell beer for consumption on the premises.