The following excerpt is from Mendocino Envt'l Center v. Mendocino County, 192 F.3d 1283 (9th Cir. 1999):
21. Under Franks v. Delaware , 438 U.S. 154 (1978), a defendant in a criminal case may obtain an evidentiary hearing by making a substantial showing that a police officer, either knowingly or with reckless disregard for the truth, included a false statement in a search warrant affidavit, and that the allegedly false statement was necessary to the finding of probable cause. 438 U.S. at 155-56. If these allegations are proven by a preponderance of the evidence at the evidentiary hearing, the defendant has established a Fourth Amendment violation and the evidence obtained through the warrant must be suppressed. Id. at 156.
21. Under Franks v. Delaware , 438 U.S. 154 (1978), a defendant in a criminal case may obtain an evidentiary hearing by making a substantial showing that a police officer, either knowingly or with reckless disregard for the truth, included a false statement in a search warrant affidavit, and that the allegedly false statement was necessary to the finding of probable cause. 438 U.S. at 155-56. If these allegations are proven by a preponderance of the evidence at the evidentiary hearing, the defendant has established a Fourth Amendment violation and the evidence obtained through the warrant must be suppressed. Id. at 156.
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