Alaska Stat. § 28.35.031
(b) A person who operates or drives a motor vehicle in this state or who operates an aircraft or watercraft shall be considered to have given consent to a preliminary breath test for the purpose of determining the alcoholic content of the person's blood or breath. A law enforcement officer may administer a preliminary breath test at the scene of the incident if the officer has probable cause to believe that a person's ability to operate a motor vehicle, aircraft, or watercraft is impaired by the ingestion of alcoholic beverages and that the person