Section 263A-10 - Evidence of intoxication(a) In any criminal prosecution for a violation of section 263-11, four-hundredths per cent or more by weight of alcohol in the defendant's blood within four hours after the time of the alleged violation as shown by chemical analysis of the defendant's blood or breath or other approved analytical technique shall be competent evidence that the defendant was under the influence of intoxicating liquor at the time of the alleged violation.(b) In any criminal prosecution for a violation of section 263-11, the amount of alcohol found in the defendant's blood within four hours after the time of the alleged violation as shown by chemical analysis of the defendant's blood or breath or other approved analytical technique shall be competent evidence of whether or not the defendant was under the influence of intoxicating liquor at the time of the alleged violation, and shall give rise to the following presumptions: (1) If there were two-hundredths per cent or less by weight of alcohol in the defendant's blood, it shall be presumed that the defendant was not under the influence of intoxicating liquor at the time of the alleged violation.(2) If there were in excess of two-hundredths per cent but less than four-hundredths per cent by weight of alcohol in the defendant's blood, that fact may be considered with other competent evidence in determining whether or not the defendant was at the time of the alleged violation under the influence of intoxicating liquor, but shall not of itself give rise to any presumption.(c) Subsection (b) shall not be construed as limiting the introduction of any other competent evidence bearing upon the question of whether or not the defendant was under the influence of intoxicating liquor at the time of the alleged violation.