US Department of Homeland Security:
More here:
Video collection- DHS checkpoints
DHS checkpoints shut down in Jefferson County WA:
Federal Policy No Longer Enforced at the Local Level?
State and local LE agencies do not conduct DUI/suspicionless checkpoints in Washington State.
DUI checkpoints elsewhere in the US:
Photo-
Platoon 3049, MCRD San Diego
Jun-Sep 1979