I've mentioned in the past about roadblocks partially staffed by MADD volunteers, and even a few run by MADD independent of the police. The evolution of DUI roadblocks continues:

Relatives of victims help at DUI checkpoints

Hilo, HI. Dec. 19 – Students and relatives of DUI victims will be helping Big Island police this week and next at DUI checkpoints.

Police said one checkpoint will be set up in Pahoa with students from Pahoa High School and students from the newly-established University Mothers Against Drunk Drivers (UMADD)…

Sounds like a calm, impartial and professional law enforcement operation.