No discussion of a DUI received from a checkpoint stop can be complete without an understanding of Ingersoll v. Palmer and its progeny, including People v. Banks. After all, a DUI checkpoint stop is the epitome of a traffic stop, warrantless search and the very type of “roving patrols” our Fourth Amendment to the U.S. Constitution sought to forbid. How then can any such arrest be legal? Many are not. However, to know which ones are illegal and which ones survive legal scrutiny, please click on the following link.