First time drunken-driving offenders in Illinois will now will have to pass a breath test every time they get behind the wheel, under legislation signed into law Friday.

The measure, among the strictest in the nation, would require an estimated 30,000 first-time offenders whose licenses have been suspended to blow into devices that measure blood-alcohol content. If alcohol is detected, the car will not start.

Known as breath alcohol ignition interlock devices, the gadgets also would test drivers periodically while the car is running.

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