I was reading about a San Diego DUI checkpoint this weekend.
DUI Checkpoints occur all over California. There is several checkpoints this weekend all over San Diego county. However, there is more and more emphasis on Saturation patrols. Saturation Patrols usually result in more DUI arrests than checkpoints. Each comes with its issues.
You can see a video about DUI Saturation patrols here.
DUI Checkpoints occur all over California. There was a recent checkpoint in neighboring San Bernardino county.