JUSTICE SCALIA delivered the opinion of the Court.
Late one evening in April 1988, Officers Brian McColgin and Jerry Pertoso were on patrol in a high-crime area of Oakland, California. They were dressed in street clothes but wearing jackets with "Police" embossed on both front and back. Their unmarked car proceeded west on Foothill Boulevard, and turned south onto 63rd Avenue. As they rounded the corner, they saw four or five youths huddled around a small red car...
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