Back in 1968, Justice William O. Douglas warned in a dissenting opinion in Terry v. Ohio, 392 U.S. 1, that the Court was opening a Pandora's box by eschewing the traditional "probable cause" standard for Fourth Amendment search and seizures in traffic stop cases, and permitting warrantless detentions based merely on "reasonable suspicion."
More than a quarter-century later, the confusion over the "reasonable suspicion" approach is still commanding the Supreme Court's attention. A pair of cases on the justices' argument calendar this spring address the tension between legitimate traffic stops and those based on pretext.
Richard C. Reuben,
Police Under the Gun, 82 ABA Journal 44
Available at: https://scholarship.law.missouri.edu/facpubs/843