Sha’atnez
According to this answer, the Taz believes that a Talmid Chacham has the right to pasken for himself, however there is an exception if something has a previous status of prohibition. Can a Talmid Chacham pasken for himself something is not shaatnez using Chazaka under this logic, or since the previous status of whether it is shaatnez is unknown is that not valid in Halacha?
Answers
I am not sure that the premise of the question is quite correct. A garment is only free of sha’atnez after it has been checked. If there is no sha’atnez, it is permissible to wear it. If there is sha’atnez, it is only permissible to be worn after the linen (or the wool) has been completely removed. It is not a matter of paskening – it is a practical matter.
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