What is a federal district court's duty to accept, reject or modify a recommendation made by a federal magistrate?

Federal Rule of Civil Procedure 72(b) and 28 U.S.C. 636(b)(1) set forth a district court's duties in connection with a magistrate judge's report and recommendation. The district court must "make a de novo determination of those portions of the report or specified proposed findings or recommendations to which objection is made," and "may accept, reject, or modify, in whole or in part, the findings or recommendations made by the magistrate judge." 28 U.S.C. 636(b)(1); see also United States v. Raddatz, 447 U.S. 667,

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