Safek echad baguf safek echad beta'arovet

Question

What is safek beguf safek beta'arovet? Specifically, what is the the safek beguf? Also, How does it relate to safek sefeka?

Answer 1

A concise explanation is brought in Halachapedia here:

If there is a safek safeka that is built of one safek about the status of the item in question and one safek since it was lost in a mixture, many rishonim consider this an invalid safek safeka. Others consider an acceptable safek safeka. One example is a safek teref piece of meat that was mixed up with other pieces of kosher meat (when bitul wasn't relevant).¹ The halacha holds that it is an invalid safek safeka.²

If it is a safek safeka with one safek that is about the status of the item potentially a dvar sheyesh lo matirin and one safek of the tarovet it is an invalid safek safeka.³

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¹ Tosfot Beitzah 3b s.v. vacherot writes that Rabbenu Tam considers a safek safeka even if one safek is about the status of an item and one safek is about a tarovet. This is also the opinion of Tosfot Zevachim 71a and Riva in Shitah Mikubeset Zevachim 74a. However, the Ri cited by Tosfot disagrees that such a safek safeka is an invalid safek safeka. Rashba Beitzah 3a s.v. nitarva explains the opinion of the Ri; since the first safek is about the status of an item we determine that we are strict since it is a safek deoritta lchumra. Then we consider the second safek however at that time there's only one other safek. Rashba responsa 401 agrees with Rabbenu Tam.

² Shulchan Aruch YD 110:9 holds it is an invalid safek safeka. Gra 110:10 writes that most poskim assume that it is an invalid safek safeka.

³ Shulchan Aruch 102:1. Shach 102:2 writes that everyone agrees for dvar sheyesh lo matirin one safek in the guf and one in the tarovet is forbidden.