Josh Moeller, of Sioux Falls, is one of them.
"I can't say I've had a drop of alcohol since I've been on the program," he told KELO-TV. "It's either do what they say or sit in jail. It sounds better than jail."
Judge Larry Long, who championed the program during his tenure as South Dakota attorney general, said the independent study lends credence to the belief he and others have had in the program from the start. The state has sponsored studies that showed a reduction in repeat offenses, but no outside agency had verified the results.
"It gives the program some credibility at the national level," Long told the Argus Leader. "I think people are inherently suspect of internal studies."
Jackley said in a statement that he hopes the study results will open the door to funding for future highway safety projects.