In any prosecution for a driving under the influence (DUI), driving while ability impaired (DWAI), vehicular assault, or vehicular homicide, if at the time of the commission of the alleged offense, or within two hours thereafter, the defendant's blood, urine, or saliva contains any amount of a schedule I controlled substance, except for tetrahydrocannabinols; a schedule II controlled substance; salvia divinorum; or synthetic cannabinoids, or the defendant's blood contains 5 nanograms or more of delta 9-tetrahydrocannabinol per milliliter in whole blood, such fact gives rise to the permissible inference that the defendant was under the influence of drugs.

The bill expands the existing definition of "DUI per se" to include driving when the driver's blood, urine, or saliva contains any amount of a schedule I controlled substance, except for tetrahydrocannabinols; salvia divinorum; or synthetic cannabinoids, and driving when the defendant's blood contains 5 nanograms or more of delta 9-tetrahydrocannabinol per milliliter in whole blood.

The bill removes statutory instances of the term "habitual user".