Where the government wrongly failed to disclose impeachment information regarding a paid confidential informant, remand was required so that the district court could examine the withheld evidence to determine its impact. The Ninth Circuit found that failing to disclose all information the government had about a confidential informant violated Brady v. Maryland (1963) 373 U.S. 83 and Giglio v. United States (1972) 405 U.S. 150. On remand the district court could review the information in camera to determine what should be turned over to the defense, but the government was required to turn over all information that might be relevant.