(a) Upon trial for the offense of driving a motor vehicle in this state while under the influence of alcohol, controlled substances, or drugs, or upon the trial of any civil or criminal action arising out of acts alleged to have been committed by any person driving a motor vehicle while under the influence of alcohol, controlled substances, or drugs, evidence of the amount of alcohol in the person’s blood at the time of the arrest or of the acts alleged, as shown by a chemical analysis of his or her blood, breath, or urine, is admissible, if the sample or specimen was taken within two hours from and after the time of arrest or of the acts alleged. The evidence gives rise to the following presumptions or has the following effect:
(1) Evidence that there was, at that time, 0.05% or less, by weight, of alcohol in his or her blood, is prima facie evidence that the person was not under the influence of alcohol;
(2) Evidence that there was, at that time, more than 0.05% and less than 0.08%, by weight, of alcohol in the person’s blood is relevant evidence, but it is not to be given prima facie effect in indicating whether the person was under the influence of alcohol;
(3) Evidence that there was, at that time, 0.08% or more, by weight, of alcohol in his or her blood, shall be admitted as prima facie evidence that the person was under the influence of alcohol.
(b) A determination of the percent, by weight, of alcohol in the blood shall be based upon a formula of:
(1) The number of grams of alcohol per 100 cubic centimeters of blood;
(2) The number of grams of alcohol per 210 liters of breath;
(3) The number of grams of alcohol per 67 milliliters of urine; or
(4) The number of grams of alcohol per 86 milliliters of serum.
(c) A chemical analysis of a person’s blood, breath, or urine, in order to give rise to the presumptions or to have the effect provided for in division (a) hereof, must be performed in accordance with methods and standards approved by the state’s Division of Health. A chemical analysis of blood or urine to determine the alcohol content of blood shall be conducted by a qualified laboratory or by the state police scientific laboratory of the Criminal Identification Bureau of the West Virginia State Police.
(d) The provisions of this article do not limit the introduction in any administrative or judicial proceeding of any other competent evidence bearing on the question of whether the person was under the influence of alcohol, controlled substances, or drugs.