Responsa for Chullin 17:38
בחזקת איסור קיימא והשתא מתה היא ומר סבר
The text [above stated]: R'Huna said: An animal while alive is presumed to be forbidden [and, therefore, remains forbidden when dead] until it becomes known to you that it was ritually slaughtered; once ritually slaughtered, it is presumed to be permitted until it becomes known to you how it became trefah'.
Shut min haShamayim
They responded: the halacha is well known - "A slaughtered animal is presumed to be kosher" (Chullin 9a:8), and "We do not presume things to be prohibited" (Rif Chullin 18a:4). Yet all who are stringent regarding the lungs will merit to sit in the Heavenly Yeshiva.
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