Hot answers tagged yoreh-deah
Presumably when we stopped concerning ourselves with the laws of purity, sometime around the year 200. Until that point I needed to know if someone was a Nida, as it would affect whether I could eat a sacrifice or the like. Since then, unless it's my wife, it's really none of my business.
Iyunei Deah by Rabbi Ullman. It contains a collection of investigations ('iyunim') into Hilchos Yoreh Deah based on the bechinos of Rabbi Zalman Nechemia Goldberg in Isur v'Heter (melicha, basar b'chalav, ta'arovos) and Nida.
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