Operating under influence of intoxicant or other drug
Wis. Stat. § 346.63
in effect(1) No person may drive or operate a motor vehicle while:
(a) Under the influence of an intoxicant, a controlled substance, a controlled substance analog or any combination of an intoxicant, a controlled substance and a controlled substance analog, under the influence of any other drug to a degree which renders him or her incapable of safely driving, or under the combined influence of an intoxicant and any other drug to a degree which renders him or her incapable of safely driving; or
(am) The person has a detectable amount of a restricted controlled substance in his or her blood.
(b) The person has a prohibited alcohol concentration.
(c) A person may be charged with and a prosecutor may proceed upon a complaint based upon a violation of any combination of par. (a), (am), or (b) for acts arising out of the same incident or occurrence. If the person is charged with violating any combination of par. (a), (am), or (b), the offenses shall be joined. If the person is found guilty of any combination of par. (a), (am), or (b) for acts arising out of the same incident or occurrence, there shall be a single conviction for purposes of sentencing and for purposes of counting convictions under ss. 343.30 (1q) and 343.305. Paragraphs (a), (am), and (b) each require proof of a fact for conviction which the others do not require.
(d) In an action under par. (am) that is based on the defendant allegedly having a detectable amount of methamphetamine, gamma-hydroxybutyric acid, or delta-9-tetrahydrocannabinol in his or her blood, the defendant has a defense if he or she proves by a preponderance of the evidence that at the time of the incident or occurrence he or she had a valid prescription for methamphetamine or one of its metabolic precursors, gamma-hydroxybutyric acid, or delta-9-tetrahydrocannabinol.
(2)
(a) It is unlawful for any person to cause injury to another person by the operation of a vehicle while:
1. Under the influence of an intoxicant, a controlled substance, a controlled substance analog or any combination of an intoxicant, a controlled substance and a controlled substance analog, under the influence of any other drug to a degree which renders him or her incapable of safely driving, or under the combined influence of an intoxicant and any other drug to a degree which renders him or her incapable of safely driving; or
2. The person has a prohibited alcohol concentration.
3. The person has a detectable amount of a restricted controlled substance in his or her blood.
(am) A person may be charged with and a prosecutor may proceed upon a complaint based upon a violation of any combination of par. (a) 1., 2., or 3. for acts arising out of the same incident or occurrence. If the person is charged with violating any combination of par. (a) 1., 2., or 3. in the complaint, the crimes shall be joined under s. 971.12. If the person is found guilty of any combination of par. (a) 1., 2., or 3. for acts arising out of the same incident or occurrence, there shall be a single conviction for purposes of sentencing and for purposes of counting convictions under ss. 343.30 (1q) and 343.305. Paragraph (a) 1., 2., and 3. each require proof of a fact for conviction which the others do not require.
(b)
1. In an action under this subsection, the defendant has a defense if he or she proves by a preponderance of the evidence that the injury would have occurred even if he or she had been exercising due care and he or she had not been under the influence of an intoxicant, a controlled substance, a controlled substance analog or a combination thereof, under the influence of any other drug to a degree which renders him or her incapable of safely driving, or under the combined influence of an intoxicant and any other drug to a degree which renders him or her incapable of safely driving, did not have a prohibited alcohol concentration described under par. (a) 2., or did not have a detectable amount of a restricted controlled substance in his or her blood.
2. In an action under par. (a) 3. that is based on the defendant allegedly having a detectable amount of methamphetamine, gamma-hydroxybutyric acid, or delta-9-tetrahydrocannabinol in his or her blood, the defendant has a defense if he or she proves by a preponderance of the evidence that at the time of the incident or occurrence he or she had a valid prescription for methamphetamine or one of its metabolic precursors, gamma-hydroxybutyric acid, or delta-9-tetrahydrocannabinol.
(2m) If a person has not attained the legal drinking age, as defined in s. 125.02 (8m), the person may not drive or operate a motor vehicle while he or she has an alcohol concentration of more than 0.0 but not more than 0.08. One penalty for violation of this subsection is suspension of a person’s operating privilege under s. 343.30 (1p). The person is eligible for an occupational license under s. 343.10 at any time. If a person arrested for a violation of this subsection refuses to take a test under s. 343.305, the refusal is a separate violation and the person is subject to revocation of the person’s operating privilege under s. 343.305 (10) (em).
(3) In this section:
(a) “Drive” means the exercise of physical control over the speed and direction of a motor vehicle while it is in motion.
(b) “Operate” means the physical manipulation or activation of any of the controls of a motor vehicle necessary to put it in motion.
(4) If a person is convicted under sub. (1) or a local ordinance in conformity therewith, or sub. (2), the court shall proceed under s. 343.30 (1q).
(5)
(a) No person may drive or operate a commercial motor vehicle while the person has an alcohol concentration of 0.04 or more but less than 0.08.
(b) A person may be charged with and a prosecutor may proceed upon a complaint based on a violation of par. (a) or sub. (1) (a) or both for acts arising out of the same incident or occurrence. If the person is charged with violating both par. (a) and sub. (1) (a), the offenses shall be joined. Paragraph (a) and sub. (1) (a) each require proof of a fact for conviction which the other does not require. If the person is found guilty of violating both par. (a) and sub. (1) (a) for acts arising out of the same incident or occurrence, there shall be a single conviction for purposes of sentencing and for purposes of counting convictions. Each conviction shall be reported to the department and counted separately for purposes of suspension or revocation of the operator’s license and disqualification.
(6)
(a) No person may cause injury to another person by the operation of a commercial motor vehicle while the person has an alcohol concentration of 0.04 or more but less than 0.08.
(b) A person may be charged with and a prosecutor may proceed upon a complaint based upon a violation of par. (a) or sub. (2) (a) 1. or both for acts arising out of the same incident or occurrence. If the person is charged with violating both par. (a) and sub. (2) (a) 1. in the complaint, the crimes shall be joined under s. 971.12. If the person is found guilty of violating both par. (a) and sub. (2) (a) 1. for acts arising out of the same incident or occurrence, there shall be a single conviction for purposes of sentencing and for purposes of counting convictions. Paragraph (a) and sub. (2) (a) 1. each require proof of a fact for conviction which the other does not require.
(c) Under par. (a), the person charged has a defense if it appears by a preponderance of the evidence that the injury would have occurred even if he or she had not been under the influence of an intoxicant, a controlled substance, a controlled substance analog or a combination thereof, under the influence of any other drug to a degree which renders him or her incapable of safely driving, or under the combined influence of an intoxicant and any other drug to a degree which renders him or her incapable of safely driving or did not have an alcohol concentration described under par. (a).
(7)
(a) No person may drive or operate or be on duty time with respect to a commercial motor vehicle under any of the following circumstances:
1. While having an alcohol concentration above 0.0.
2. Within 4 hours of having consumed or having been under the influence of an intoxicating beverage, regardless of its alcohol content.
3. While possessing an intoxicating beverage, regardless of its alcohol content. This subdivision does not apply to possession of an intoxicating beverage if the beverage is unopened and is manifested and transported as part of a shipment.
(b) A person may be charged with and a prosecutor may proceed upon complaints based on a violation of this subsection and sub. (1) (a) or (b) or both, or sub. (1) (a) or (5) (a), or both, for acts arising out of the same incident or occurrence. If the person is charged with violating this subsection and sub. (1) or (5), the proceedings shall be joined. If the person is found guilty of violating both this subsection and sub. (1) or (5) for acts arising out of the same incident or occurrence, there shall be a single conviction for purposes of sentencing and for purposes of counting convictions. This subsection and subs. (1) and (5) each require proof of a fact for conviction which the others do not require. Each conviction shall be reported to the department and counted separately for purposes of suspension or revocation of the operator’s license and disqualification.
Source: WI Statutes (Official Site)URL: https://docs.legis.wisconsin.gov/document/statutes/346.63Fetched: 10/7/2026