Attorney General Marty Jackley says a new report is further evidence that South Dakota's 24/7 Sobriety Program is working.
The program was started in 2005, giving people convicted of alcohol-related crimes a chance to stay out of jail as long as they stay sober. They're monitored twice-daily for alcohol use.
Jackley says results from a Mountain Plains Evaluation study show that less than 1 percent of about 1 million test results studied were recorded as either "failed" or a "no show."
Another recent independent study concluded that the sobriety program has reduced repeat cases of driving under the influence by 12 percent and domestic violence rates by 9 percent.
The program has expanded to include alcohol-monitoring bracelets and interlock devices installed on vehicle ignition systems.