Michael Francis v. United States

Were Petitioner’s Fourth Amendment rights violated when an FBI Agent, acting on information from an informant, obtained a search warrant for Petitioner’s car from a Magistrate, but the FBI Agent deliberately withheld from the affidavit in support of the warrant the facts that the informant had been convicted of a felony crime of dishonesty and had lied to the police when arrested, such that the FBI Agent, rather than the Magistrate, made the determination of whether the informant was reliable and credible?