DY: Your right that TKI is only aino mino, and in some circumstances we may be able to use as a tziruf the Poskim who rule like Rashi that even aino mino is d’Rabanan. Especially since the Rashba who is the source of the Shulchan Aruch’s psak bases his ruling on the fact that it is an issue of an issur d’Oraisa and safek d’Oraisa l’hachmir. Beis Yosef follows him for the same reason, so there are grounds to say that TKI is a safek not vadai. However, Shulchan Aruch in YD 98:2 paskens safek TKI is assur b/c safek d’Oraisa, and is not a sfek sfeka. See Pri Megadim in 98, hakdama to Taaruvos and hakdama to Basar bChalav and hanhagas shoel v’nishal where he seems to contradict himself if this psak of Shulchan Aruch makes TKI a vadai d’Oraisa or just not a safek ha’shakul that doesn’t count for a sfek sfeika.
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