The magistrate judge's seat is not a separate court; the authority that a magistrate judge exercises is the
jurisdiction of the district court itself, delegated to the magistrate judge by the district judges of the court under governing statutory authority, local rules of court, or court orders. Rather than fixing the duties of magistrate judges nationwide, the
Federal Magistrates Act allows each district court to assign duties to the magistrate judges as fits the needs of that court. In criminal proceedings, magistrate judges preside over
misdemeanor and petty offense cases, and as to all criminal cases (felony and misdemeanor) may issue
search warrants,
arrest warrants, and
summonses, accept criminal complaints, conduct initial appearance proceedings and detention
hearings, set
bail or other conditions of release or detention, hold
preliminary hearings and examinations, administer
oaths, conduct
extradition proceedings, and conduct evidentiary hearings on
motions to suppress evidence in felony cases for issuance of reports and recommendations to the district judge. The Supreme Court has held in
Peretz v. United States that magistrate judges may supervise the
jury selection in a felony trial unless a
party objects. In civil proceedings, magistrate judges typically manage
discovery and other pretrial matters. They are authorized to issue
orders in pretrial matters as long as the order is not
dispositive of the case as a whole (for example, an order granting
summary judgment is not within their purview). They may also be assigned to write reports and recommendations to the district judge as to dispositive matters. With the consent of the parties, they may
adjudicate civil cases in the same manner as a district judge, including presiding over jury or non-jury trials. ==Assignment==