(2) The provisions of the implied consent law shall not be construed by any court to limit the introduction of otherwise competent, relevant evidence of the amount of alcohol in the blood of a defendant in a prosecution for driving while under the influence of intoxicants. [1983 c.338 §596; 1985 c.16 §302; 1999 c.437 §1; 2019 c.475 §9]