(a) Upon the trial of a civil or criminal action or proceedings arising out of acts alleged to have been committed by a person operating a commercial motor vehicle while under the influence of an alcoholic beverage in violation of AS 28.33.030, the following rules apply with regard to the amount of alcohol in the person's blood or breath at the time alleged:
(1) if there was less than 0.04 percent by weight of alcohol in the person's blood, or less than 40 milligrams of alcohol per 100 milliliters of the person's blood, or less than 0.04 grams of alcohol per 210 liters of the person's breath, that fact does not give rise to a presumption that the person was or was not under the influence of an alcoholic beverage, but that fact may be considered with other competent evidence in determining whether the person was under the influence of an alcoholic beverage;
(2) if there was 0.04 percent or more by weight of alcohol in the person's blood, or 40 milligrams or more of alcohol per 100 milliliters of the person's blood, or 0.04 grams or more of alcohol per 210 liters of the person's breath, it is presumed that the person was under the influence of an alcoholic beverage.
(b) For purposes of this chapter, percent by weight of alcohol in the blood is based upon milligrams of alcohol per 100 milliliters of blood.
(c) The provisions of (a) of this section may not be construed to limit the introduction of any other competent evidence bearing upon the question of whether the person was or was not under the influence of an alcoholic beverage.
(d) The person tested may have a physician, or a qualified technician, chemist, registered or advanced practice registered nurse, or other qualified person of the person's own choosing administer a chemical test in addition to the test administered at the direction of a law enforcement officer. The failure or inability to obtain an additional test by a person does not preclude the admission of evidence relating to the test taken at the direction of a law enforcement officer; the fact that the person under arrest sought to obtain an additional test, and failed or was unable to do so, is likewise admissible in evidence.
(e) Upon the request of the person who submits to a chemical test at the request of a law enforcement officer, full information concerning the test, including the results of it, shall be made available to the person or person's attorney.