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HB 4333

DUI-CHANGE LIMIT 0.08 TO 0.05

104th Regular Session Introduced by Dan Didech

Illinois bill reduces DUI legal limit from 0.08% to 0.05% BAC to prevent alcohol-impaired driving and reduce traffic fatalities through stricter enforcement standards.

Referred to Rules Committee
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Bill Summary · HB 4333

Legislative bill overview

HB 4333 proposes lowering Illinois's legal blood alcohol content (BAC) limit for driving under the influence from 0.08% to 0.05%. This would make Illinois more restrictive than the current federal standard and align it with stricter DUI thresholds adopted by some other states and countries.

Why is this important

Lowering the BAC threshold could reduce alcohol-related traffic fatalities and injuries by catching impaired drivers at earlier stages of intoxication. However, it would also expand the population of drivers subject to DUI charges and penalties, affecting enforcement priorities, court workload, and individual consequences for drivers with BAC levels between 0.05-0.08%.

Potential points of contention

  • Public health vs. personal liberty: Advocates cite traffic safety data showing impairment risk increases at 0.05%, while critics argue the change criminalizes behavior many view as socially acceptable and within personal choice
  • Economic and enforcement burden: Implementation requires updating police training, breathalyzer calibration, and court resources; some law enforcement question whether resources are better spent on higher-BAC offenders
  • Scientific debate: While NHTSA research supports 0.05% as an impairment threshold, some studies dispute whether it meaningfully improves safety outcomes compared to 0.08% enforcement, particularly for average drivers

Compiled from official sources — confirm details with the bill’s official record.

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