(a) A person may not operate a commercial motor vehicle or be on duty

(1) if, within the preceding four hours, the person

(A) consumed or was under the influence of

(i) an alcoholic beverage;

(ii) a controlled substance not prescribed by a physician; or

(iii) a controlled substance prescribed by a physician that might impair a person's ability to operate a commercial motor vehicle; or

(B) had any measurable alcohol concentration within the blood or breath or any detectable presence of alcohol;

(2) while in possession of an alcoholic beverage or a controlled substance not prescribed by a physician unless

(A) the alcoholic beverage or controlled substance is manifested and documented as part of an authorized shipment of cargo; or

(B) under AS 04, the alcoholic beverage may be legally served to passengers being carried for hire;

(3) after being placed out of service for violation of a regulation adopted under AS 19.10.060(c) or AS 28.05.011; or

(4) with an invalid operator's or commercial operator's license.

(b) An employer, or a peace officer, who has reasonable grounds to believe that a person has violated (a) of this section, shall immediately give the person a written notice ordering the person out of service. If it is not possible to issue a written out of service order, a verbal order may be issued. An employer may not knowingly allow, require, permit, assign, or authorize a person to operate a commercial motor vehicle or be on duty during a period in which

(1) the person has been ordered out of service under this section; or

(2) the person has violated (a) of this section, even if an out-of-service order has not been issued.

(c) A person who is ordered out of service

(1) may not operate a commercial motor vehicle or be on duty for 24 hours following issuance of the out-of-service order; and

(2) shall report that fact, in writing,

(A) within 24 hours to the person's employer; and

(B) within 30 days to the department if the person possesses a commercial motor vehicle license.

(d) In this section, “on duty” means the period of time in which a person is

(1) required by the person's employer to be ready to immediately operate a commercial motor vehicle, including time spent waiting to be assigned to operate a commercial motor vehicle;

(2) inspecting, servicing, or conditioning a commercial motor vehicle;

(3) in or upon a commercial motor vehicle, except time spent resting in a sleeper berth;

(4) loading or unloading, or supervising the loading or unloading of, a commercial motor vehicle, or giving or receiving receipts for shipments loaded or unloaded;

(5) taking action, as required by state or federal law, following an accident involving a commercial motor vehicle; or

(6) repairing or obtaining assistance for a disabled commercial motor vehicle.