(A) No person who is under the influence of intoxicating liquor or narcotic drugs shall drive any vehicle within the park system.
(B) Upon any trial for such offense, in addition to other evidence, evidence of the amount of alcohol in the person at the time of the act alleged, as shown by a chemical analysis of his breath, blood, urine, saliva, or other bodily substances is admissible, and the result of any such analysis shall give rise to the presumptions set forth in § 47 of the Uniform Act Regulating Traffic on Highways, approved July 9, 1935 as amended.
('79 Code, § 2003) Penalty, see § 98.99