The study evaluated the first year of Pennsylvania's Ignition Interlock Law. The researchers found that the devices stopped convicted drunk drivers from driving under the influence 10,142 times.

Under the law, drivers must breathe into the device before starting their vehicles, and conduct breath tests throughout their time on the road. The ignition interlock device prevents the car from running if the driver's blood-alcohol level is above 0.025 percent.

Other states are expected to follow Pennsylvania's lead and conduct evaluations of their ignition-interlock programs. Currently, 41 states and the District of Columbia have some form of ignition-interlock law.

The study was conducted by the Pennsylvania DUI Association.

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