On the evening of Sept. 1, the rangers set up a DUI checkpoint on Crater Rim Drive near the park's entrance station.

In a 4-hour period, six rangers contacted the drivers of 95 cars.

"Most drivers expressed strong support for our efforts to reduce drunk driving," said Park Ranger John Broward.

Rangers arrested and charged two motorists for driving under the influence.

Manuel Guzman, 24, of Hilo, was charged with driving under the influence, possession of a controlled substance, conveying false information, driving without a license and having an open beverage container containing alcohol in his vehicle.

Also arrested was Kenneth A. Moniz, 47, of Hilo. Moniz was charged with driving under the influence and driving with a revoked license. A background check indicated he was wanted by Hawai'i County Police on a traffic warrant.

Rangers also arrested Abraham Paredes, 21, an illegal immigrant from Mexico. Paredes was charged with public intoxication, illegal possession of a controlled substance and conveying false information. A criminal history check revealed that Paredes had an outstanding bench warrant issued in Minnesota for first-degree felony drug trafficking. He will be extradited to Minnesota and faces prison time and/or deportation to Mexico.

"Because of the success of the DUI checkpoint and the public support we've received, we will continue to use this technique to reduce drunk driving on park roads," added Broward.