Idaho Code § 23-603
Any person who is eighteen (18) years of age or older who shall sell, give, or furnish, or cause to be sold, given, or furnished, alcohol beverage, including any distilled spirits, beer or wine, to a person under the age of twenty-one (21) years shall be guilty of a misdemeanor and upon conviction thereof may be punished by a fine of not less than five hundred dollars ($500) nor more than one thousand dollars ($1,000) per violation, or by imprisonment in the county jail for a period not to exceed one (1) year, or by both such fine and imprisonment. A second or subsequent violation of this section by the same defendant shall constitute a misdemeanor and upon conviction thereof the defendant shall be punished by a fine of not less than one thousand dollars ($1,000) nor more than two thousand dollars ($2,000) per violation, or imprisonment in the county jail for a period not to exceed one (1) year, or by both such fine and imprisonment. Notwithstanding the provisions of section 19-4705, Idaho Code, moneys received pursuant to such fines shall be deposited in the substance abuse treatment fund, as created in section 23-408, Idaho Code. Upon conviction of any person for a violation of the provisions of this section, the court shall notify the director of the Idaho state police. The director shall review the circumstances of the conviction, and if the dispensing took place at a licensed establishment or other retailer or distributor, the director may take administrative action he considers appropriate against the licensee or business including suspension of the license for not to exceed six (6) months, a fine, or both such suspension and fine.
Idaho Code § 23-603