Utah v. Strieff

The attenuation doctrine does apply when an officer makes an unconstitutional investigatory stop, learns during that stop that the suspect is subject to a valid arrest warrant, and then arrests the subject and seizes incriminating evidence during a search incident to that arrest. The Court rules the presence of a valid arrest warrant is an “extraordinary intervening circumstance” that breaks the causal chain between the unconstitutional stop and the evidence found. Read.