What is the test for determining whether a police officer violated the Fourth Amendment by stopping and questioning defendants in a traffic light?

MultiRegion, United States of America

The following excerpt is from United States v. Morales, 252 F.3d 1070 (9th Cir. 2001):

The threshold inquiry is whether the officers' decision to stop the defendants violated the Fourth Amendment. If the initial stop was unconstitutional, then all evidence seized as a result of the stop must be suppressed as the fruit of the poisonous tree. See Wong Sun v. United States, 371 U.S. 471, 484-85 (1963).

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