Thurgood Marshall, United States v. Sokolow — Dissenting Opinion
“ It is not enough to suspect that an individual has committed crimes in the past, harbors unconsummated criminal designs, or has the propensity to commit crimes. On the contrary, before detaining an individual, law enforcement officers must reasonably suspect that he is engaged in, or poised to commit, a criminal act at that moment. See, e.g., Brown v. Texas, 443 U.S. 47, 51, 99 S.Ct. 2637, 2641, 61 L.Ed.2d 357 (1979) (to detain, officers must "have a reasonable suspicion, based on objective facts, that the individual is involved in criminal activity") ”
