AN ACT relating to driving under the influence of marijuana.
HB34 would expand Kentucky’s DUI laws to expressly cover marijuana impairment and create a blood-based marijuana concentration standard. The bill defines “marijuana concentration” as nanograms of tetrahydrocannabinol per milliliter of blood and makes it unlawful to operate or be in physical control of a motor vehicle with a marijuana concentration of 5 or more within two hours of driving. It also establishes evidentiary presumptions: below 4 nanograms presumptively means the driver was not under the influence, while 4 to under 5 nanograms is not a presumption either way but may be considered with other evidence.
The bill revises multiple parts of Chapter 189A to integrate marijuana into Kentucky’s DUI framework. It updates penalty, license suspension, hardship license, ignition interlock, and pretrial suspension provisions so that marijuana-related DUI offenses are treated similarly to alcohol- and other substance-related offenses. It also amends the list of aggravating circumstances and preserves existing rules for controlled substances other than marijuana, while excluding marijuana from the controlled-substance blood-detection offense in KRS 189A.010(1)(d).
HB34 would amend Kentucky Revised Statutes Chapter 189A, especially KRS 189A.005, 189A.010, 189A.050, 189A.070, 189A.090, 189A.240, 189A.410, and 189A.340. Its main legal effect is to create a per se marijuana DUI offense based on blood concentration and to align related criminal penalties, administrative license suspensions, ignition interlock requirements, and hardship driving privileges with the new marijuana offense. It would also affect drivers, courts, law enforcement, prosecutors, the Transportation Cabinet, ignition interlock providers, and defendants facing DUI charges.
No committee transcripts or recorded votes were provided, so there is no direct evidence of legislative debate or support/opposition in the available materials. Based on the bill text alone, the measure appears to take a public-safety-oriented approach by adding a clear marijuana impairment threshold and extending existing DUI enforcement tools to marijuana cases. The structure of the bill suggests an intent to standardize enforcement rather than create a separate, lenient regime.
The most likely point of contention is the choice of a per se marijuana blood concentration threshold, since THC levels can be difficult to correlate with actual impairment and can vary based on prior use, metabolism, and timing. Another likely issue is the bill’s reliance on blood testing within two hours of driving, which may raise practical and evidentiary concerns for law enforcement and defendants. Stakeholders who may disagree include law enforcement and highway safety advocates, who may favor clearer enforcement standards, and civil liberties, defense, or cannabis policy advocates, who may question the scientific basis and fairness of the threshold.