Professor Doug Berman has this post at Sentencing Law & Policy, excerpting an A.P. story.  From the excerpt:

Twice a day for three years, Chris Mexican has showed up at the county jail in Pierre to blow into a tube and prove he hasn’t been drinking. After several drunken driving convictions, it has allowed him to remain free and to become a better, more clearheaded father to his kids….

South Dakota’s 24-7 sobriety program has helped curb drunken driving and domestic violence, and some incentives for states that adopt the model were included in the $305 billion transportation law that President Barack Obama signed [earlier this month].

. . .

An independent study released in 2013 by the RAND Corp., a nonprofit think tank, found that South Dakota’s program cut the rate of repeat DUI arrests at the county level by 12 percent and domestic violence arrests by 9 percent in its first five years. “These are large reductions when you consider that we’re talking about the community level,” said Beau Kilmer, who conducted the study and continues to research the program.