Will One Drink Put You Over the Limit? Illinois’ Proposed 0.05 BAC Law

f you enjoy a glass of wine with dinner or a beer at a Chicago Bears game, the legal landscape in Illinois may be about to shift beneath your feet.

As of early 2026, Illinois lawmakers are formally considering House Bill 4333, a piece of legislation that would lower the “presumptive” blood alcohol concentration (BAC) limit from 0.08% to 0.05%. While this might sound like a minor mathematical adjustment, it represents one of the most radical changes to Illinois DUI law in decades.

What is HB 4333?

Introduced by Representative Daniel Didech and gaining momentum in the House Rules Committee this February, HB 4333 seeks to align Illinois with Utah—the only other state with a 0.05 limit—and several international standards.

The bill doesn’t just apply to cars. It would lower the limit for:

• Standard motor vehicles
• Snowmobiles
• Boats and watercraft

The “One Drink” Reality: How 0.05 Affects You

The most common question I hear as a defense attorney is, “How many drinks is that?” Under a 0.08 limit, most average-sized men could have 2–3 drinks in an hour and remain under the limit. Under a 0.05 limit, the margin for error disappears.

• For a 160lb man: Two 12oz beers in a single hour could put you at or above 0.05.
• For a 120lb woman: A single 5oz glass of wine could bring you dangerously close to the 0.05 threshold.

At 0.05, you may not “feel” drunk. You likely aren’t slurring your speech or stumbling. However, HB 4333 makes 0.05 the presumptive limit, meaning the law presumes you are impaired based on the number alone, regardless of how you actually behave.

Why Is This Happening Now?

Proponents of the bill, including organizations like MADD, argue that impairment begins long before 0.08. They point to data suggesting that reaction times and coordination are significantly degraded at 0.05.

However, as a defense lawyer with over 20 years of experience, I see the other side: increased litigation. Lowering the limit will likely lead to a surge in “borderline” DUI arrests where the driver shows no outward signs of intoxication but is trapped by a breathalyzer reading that was perfectly legal just a year ago.

What Should You Do?

Currently, the legal limit in Illinois remains 0.08, but HB 4333 is moving through the General Assembly. If this bill passes, the “social drinker” will become the “target drinker” for law enforcement.

Note: Even under current law, you can still be charged with a DUI if your BAC is between 0.05 and 0.08 if the officer observes actual impairment. HB 4333 simply makes that 0.05 reading enough to convict you on its own.

Speak with an Experienced Chicago DUI Attorney

If you are facing a DUI charge or have questions about how these changing laws affect your CDL or driving privileges, don’t wait for the law to change to get informed.

Court houses we often appear at are located at:

Cook County

• George N. Leighton Criminal Court Building 2600 S, California Avenue, Chicago, IL. 
• Skokie Courthouse, 2nd District Cook County. Located at 5600 Old Orchard Rd., Skokie, IL. 
• Rolling Meadows Courthouse, 3rd District, Cook County. Located at 2121 Euclid Ave., Rolling Meadows, IL. 
• Maywood Courthouse, 4th District, Cook County. Located at 1311 Maybrook Dr, Maywood, IL. 
• Bridgeview Courthouse, 5th District, Cook County. Located at 10220 S 76th Ave., Bridgeview, IL. 
• Markham Courthouse, 6th District, Cook County. Located at 16501 Kedzie Ave, Markham, IL.

DuPage County

• DuPage County Court, 505 N County Farm Rd, Wheaton, IL 60187

Will County

• Will County Court, 100 W. Jefferson Street, Joliet, IL 60432

Contact Chicago Premier Criminal Defense Lawyer today to schedule a free and confidential consultation