72.2      Assignment of matters to magistrate judges - Unless otherwise ordered by the district judge to whom a case is assigned, the magistrate judge assigned to any case may hear and determine any nondispositive pretrial matters in that case without any further order of reference.

1. General cases - The method for assignment and reassignment of duties to a magistrate judge and for the allocation of duties among the several magistrate judges of the court shall be made in accordance with orders of the court or by special designation of the Chief Judge.
2. Habeas corpus and prisoner civil rights cases - At the time of filing any habeas corpus or prisoner civil rights case, the clerk shall assign the case to a district judge and to a magistrate judge in accordance with procedures established by these rules and the implementing orders of the court. The assigned magistrate judge may enter such orders and conduct such proceedings in that case as are authorized by statute or rule, without any further order of reference. An order disposing of the case may only be entered by a district judge.