(heard from R’ Mendel Aronow): The Tzemach Tzedek used to get countless halachik queries from all over the world. In the later years of the Tzemach Tzedek, he wouldn’t answer the letters himself, but would delegate that task to one or 2 of his sons. The finished teshuva would then be brought to the Tzemach Tzedek for his approval, before being sent out. [It should be noted that there was a similar practice during the lifetime of the Mitteler Rebbe, when the Mitteler Rebbewould give the incoming shailos to the Tzemach Tzedek to respond to them, and then would look over the answers]. On one occasion, there was a complex shailoh regarding an agunah: A man had disappeared, and there were numerous indications that he had, in fact, died. The question was whether the evidence was halachikally sufficient to establish that the man was (al pi Torah) dead, and to therefore permit his wife to get remarried. The son of the TzemachTzedek (the Mahari”l?) wrote an involved teshuva, in which he cited various halachiksources that supported the fact that the evidence could be accepted as legitimate proof that the husband was indeed dead, and that according to Torah his wife was free to remarry. Upon completion, he dutifully brought his handiwork to the Tzemach Tzedek for his approval. The Tzemach Tzedek began reading the teshuva, and his son recognized from his facial expressions that he found something objectionable with it. “What is it father?” he asked, “Did you find fault with the source I brought from tosefos?”   “No, no”, replied the Tzemach Tzedek, “your source from tosefos is irrefutable”. The Tzemach Tzedek, continued to read, and again his expressions seemed far from pleased. “What is it father?” his son inquired again, “do you not agree with the reasoning that I borrowed from the shach?” “No, no”, replied the Tzemach Tzedek again, “your reasoning is sound and your logic beyond reproach”. The Tzemach Tzedek continued to read, but his displeasure was clearly evident. “Father”, cried the Maharil, “if I erred in my judgment, please inform me and I will correct it. I can clearly see that something is troubling you about this teshuva, and I will not leave you until you tell me what it is”. So the Tzemech Tzedek enlightened him: “There is nothing faulty with your reasoning orwith any of your halachik sources. Your conclusions are sound. Ober vos zol ich ton azich zei doch az er lebt (But what can I do when I can see that he is alive)!”