Idaho Code § 23-949
It is unlawful for any person under the age of twenty-one (21) years to sell, serve or dispense beer, wine or other alcoholic liquor; provided, however, that any person who is nineteen (19) years of age or older may sell, serve and dispense liquor, beer or wine in the course of his employment in any place as defined in section 23-942, Idaho Code, or other place where liquor, beer or wine is lawfully present so long as such place is the place of employment for such person under twenty-one (21) years of age.
For purposes of this section, a person who sells, serves or dispenses liquor, beer or wine in compliance with the provisions of this section shall not be deemed to "possess" alcohol in violation of section 23-604, Idaho Code.
Any person violating the provisions of this section shall be guilty and punished in accordance with section 18-1502, Idaho Code.
Idaho Code § 23-949