Sioux Falls, SD
Officers stopped vehicles on Interstate 229 to see if drivers had been drinking before they got behind the wheel this weekend.
The checkpoint ran from 10:00 Friday night to 2:00 Saturday morning.
Authorities arrested seven people by midnight. Police say some arrests made during the checkpoint were drug-related.
The highway patrol says checkpoints are a useful tool in getting drunk drivers off the road, as well as keeping people from drinking and driving in the first place.