Jerusalem Talmud Yevamot 12:5

משנה: חָֽלְצָה בִשְׁנַיִם אוֹ בִשְׁלֹשָׁה וְנִמְצָא אֶחָד מֵהֶן קָרוֹב אוֹ פָסוּל חֲלִיצָה פְסוּלָה. רִבִּי שִׁמְעוֹן וְרִבִּי יוֹחָנָן הַסַּנדְּלָר מַכְשִׁירִין. מַעֲשֶׂה שֶׁחָֽלְצָה בֵינָהּ לְבֵינוֹ בְּבֵית הָאֲסוּרִין וּבָא מַעֲשֶׂה לִפְנֵי רִבִּי עֲקִיבָה וְהִכְשִׁיר. MISHNAH: If she performed ḥalîṣah in front of two [judges]¹⁰⁹Which is invalid in the opinion of some authorities, cf. Yevamot 12:1:2-17" href="/Jerusalem_Talmud_Yevamot.12.1.2-17">Halakhah 1. or of three when it turned out that one was a relative or unfit¹¹⁰According to everybody, a court of law is incompetent if it turns out that one of the judges is a relative of one of the parties or of another judge, or if he had been declared unfit to be a judge., the ḥalîṣah is invalid; Rebbi Simeon and Rebbi Joḥanan the Alexandrian declare it valid. If happened that she performed ḥalîṣah between herself and him in jail; the case came before Rebbi Aqiba and he declared it valid¹¹¹Since this is a report of an actual case, it represents practice (at least in cases of emergency)..

הלכה: חָֽלְצָה בִשְׁנַיִם כול׳. בְּבֵית הָאֲסוּרִים הָיָה מַעֲשֶׂה. וּלְבֵית הָאֲסוּרִים בָּא הַמַּעֲשֶׂה. רִבִּי יוֹחָנָן הַסַּנְדְּלָר עֲבַד גַּרְמֵיהּ רוֹכֵל. יוֹמָא עָבַר קוֹמֵי בֵּית חֲבִישָׁה דְּרִבִּי עֲקִיבָה וַהֲוָה מַכְרִיז וְאָמַר. מָאן בָּעֵי מַחֲטִין. מָאן בָּעֵי צִינּוֹרִין. חָֽלְצָה בֵינוֹ לְבֵינָהּ מַהוּ. אוֹדִיק לֵיהּ רִבִּי עֲקִיבָה מִן כִּווְתָּא. אָמַר לֵיהּ. אִית לָךְ כּוּשִׁין אִית לָךְ כָּשֵׁר. HALAKHAH: “If she performed ḥalîṣah in front of two,” etc. The case happened in a jail and was resolved in a jail¹¹²Reported by Amoraim in the Yevamot.105b">Babli, 105b.. Rebbi Joḥanan the Alexandrian dressed up as a pedlar. One day, he passed in front of the place of confinement of Rebbi Aqiba¹¹³In the aftermath of the war of Bar Kokhba, when the teaching of Jewish law in Palestine was a capital crime. Therefore, the questions had to be couched in such terms that an Aramaic speaking Gentile would not understand question or answer., he cried aloud and said, “who needs needles, who needs hooks, what is if she performed ḥalîṣah between herself and him?” Rebbi Aqiba pushed himself tightly to the hole and said: “Do you have spindles? You have valid!”