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6. The criteria for a valid court?
As explained above, the Peruzbal is only effective if it is performed before a valid court of law. A valid court consists of any three Kosher Jewish men.
May relatives serve in the Beis Din accepting the Peruzbal documents?
Yes. They may be relatives of the lender and of each other. However, some Poskim are stringent in this matter.
 Admur 35; Rama 67:18 “One may be lenient in these times”
Other opinions: Many Poskim rule that regarding a Peruzbal the court is only valid if it is a prestige court that consists of three Jews that are expert in the laws of a Peruzbal and Shemita and have been appointed by the townspeople. [Michaber 67:18; Rambam 9:17 based on Gittin 36b “A Peruzbal can only be made by a court of law equivalent to Rav Ami and Rav Assi.”]
 Meaning that he has not done a transgression which invalidates him from becoming a judge, as explained in the Choshen Mishpat Chapter 7 regarding judges and Chapters 34 and 45 regarding witnesses and the same applies for judges. [7:9] Practically this includes all standard Orthodox Jews.
 Maharikash 67:31; Teshuvah Meahava 1:72; Minchas Yitzchak 10:140; Tzitzis Eliezer 6:39; Nitei Gavriel 29:1 in name of Rav SZ”A and Minchas Yitzchak
 Tumim 67:123 leaves this matter in question; Rabbanim brought in Nitei Gavriel ibid foonote 2-3