PIERRE, S.D. (AP)- More than two-thirds of South Dakota counties have embraced an initiative by Attorney General Larry Long to keep chronic drunken drivers off the road.

If ordered by judges, repeat drunken drivers in those counties must report to sheriffs offices twice a day for breath testing or other means of detecting alcohol consumption.

People are taken immediately to jail if tests show that they've been drinking alcohol. Those who miss appointments are tracked down and locked up.

The effort began two years ago as a pilot project in 14 counties. It worked so well that Long persuaded this year's Legislature to expand it statewide. The law went into effect July 1, and 46 of the state's 66 counties are now signed up.

Training sessions were held recently in five locations.

County participation is voluntary, but Long hopes all counties eventually will get on board.

Data from the pilot effort showed a 99 percent success rate, Long said. Most of those people were in the program for about four months.

The new law also expands the testing to drugs, either by urinalysis or special detection patches.

"We've got really fabulous compliance numbers on alcohol. I'm anxious to see what the compliance numbers are for drugs," Long said, admitting that it will be especially difficult to toe the line for those who are hooked on highly addictive drugs such as methamphetamine.