Attitudes about law enforcement sobriety checkpoints have changed, according to South Dakota Highway Patrol Capt. Rod Olerud.

Some of the people who were stopped at checkpoints 20 years ago were offended, says Olerud.

Now, he says, it's common for motorists to thank the troopers. In fact, many of them say, "Keep up the good work," Olerud said.

Some people even bring hot cider, coffee or snacks to the troopers.

"People understand the importance of it," said Lt. Rob Weinmeister, who adds that it feels good to know the work is appreciated - and that they're making a difference.

In 2000, the patrol increased the number and frequency of the checkpoints because of the number of alcohol-related fatal crashes, Olerud said.

Also, education was increased and focused more on the under-25 age group because alcohol-related crashes tend to occur more in that age group, Weinmeister said.

It seems to be working, Olerud said, as fatal crash numbers have been down the last two years.

"We know we're making progress," he said.

Past arrests and the number of alcohol-related crashes are two of the factors that determine the location and frequency of checkpoints. In the Aberdeen district, troopers and squad sergeants make recommendations, and Weinmeister researches the statistics. It's up to Olerud to approve the site.

The Highway Patrol must announce upcoming checkpoints through the media but only the timeframe and the county are listed. Olerud said the notices help by being a deterrent.

Checkpoints can happen any time, anywhere, although they are set up on roads with enough room to safely hold a checkpoint.

State troopers often conduct checkpoints jointly with county and city law enforcement.

Everyone is stopped, and authorities determine if the driver shows signs of impairment. If not, they're sent on their way.

If impairment is detected, the driver gets the standard sobriety tests, including a breathalyzer. Drivers will be arrested if they are over the legal limit or are obviously impaired, Weinmeister said.

For others who have been drinking and should not be driving, troopers will find the person a safe ride home, Weinmeister said.

"We're not going to let them drive," Olerud said.