What are the duties of a district judge in connection with a report and recommendation issued by a federal magistrate?

The duties of the district court in connection with a report and recommendation issued by a magistrate judge are set forth in Federal Rule of Civil Procedure 72(b) and 28 U.S.C. 636(b). The district judge must "make a de novo determination of those portions of the report . . . to which objection is made," and "may accept, reject, or modify, in whole or in part, the findings or recommendations made by the magistrate." 28 U.S.C. 636(b). The district court need not review de novo those portions of a report and recommendation to which neither party objects. See Wang v. Masaitis, 416 F.3d 992, 1000 n.13 (9th Cir.

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2005); United States v. Reyna-Tapia, 328 F.3d 1114, 1121 (9th Cir. 2003) (en banc) ("Neither the Constitution nor the [Federal Magistrates Act] requires a district judge to review, de novo, findings and recommendations that the parties themselves accept as correct.").