Rabbnon in the times of the Mishnah said you are not allowed to have milk that a goy milked without a Jew watching and there is a teshuva that was sent to a specific situation that was מתיר but since when do we change a Halacha that was practiced thousands of years based on a teshuva that was sent to a specific person in a specific situation especially when the teshuva itself says I don’t eat chalv stam nor should a ball nefesh eat chalav stam.chalav stam is not recognized as kosher even by the non jews as you can see that in any kosher aisle of a store even when it’s a completely non Jewish store with a kosher aisle there is no chalav stam
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