Whether 28 U.S.C. § 636(b)(1) requires a district judge to rehear live testimony whenever a party objects to a magistrate's credibility findings on a dispositive motion.
Holding
No. The statute requires a de novo determination of properly contested matters, not a de novo evidentiary hearing.
Reasoning
Section 636 distinguishes between nondispositive pretrial matters, which a magistrate may decide subject to limited review, and dispositive matters such as criminal suppression motions. For the latter, a magistrate may conduct hearings and submit proposed findings and recommendations, but only the district judge may issue the final disposition.
The ordinary meaning and legislative history of the 1976 amendments establish that Congress deliberately required a de novo “determination,” rather than a de novo “hearing.” The House Report expressly stated that a judge normally may make an independent decision from the record developed before the magistrate and need not conduct a new hearing merely because an objection was filed.
The district judge must give fresh consideration to challenged portions of the magistrate's report and is not bound by the magistrate's findings. But the statute leaves the judge discretion to accept, reject, or modify the recommendation, receive further evidence, call witnesses, or recommit the matter to the magistrate when those steps are warranted.
Requiring a second live hearing whenever a party challenged credibility would substantially defeat Congress's purpose in expanding magistrates' authority: relieving the growing workload of district courts while preserving final decisionmaking authority in Article III judges.