Responsa על חולין 94:45

I also asked [in the dream] whether the lung needs to be taken out and inspected to remove any doubt about its appearance, such as the shade of black¹The Talmud states that if the lung is 'black as ink', it is not kosher, but if it is a dark blue it is (Chullin 47b:3), see Rif Chullin 11b:3 . For some are stringent and say that it cannot be declared kosher until there is absolute certainty regarding any doubtful issues²See Beit Yosef Yoreh Deah 39 who brings a number of early authorities, includng the Halachot Gedolot and R. Eliezer ben Natan, who hold that the rules of majorities don't apply in inspection of animals. Others hold that after [the lungs] are inspected manually, no doubt or assumption can be cast on the validity of the animal³The opinion of Rashi on Chullin 12a:1 is that since the majority of animals are kosher, most of the 18 disqualifications don't need to be examined, and even regarding the piercing of the lungs, if it is not possible to examine them then they are assumed to be valid. Samuel ben Isaac rules like Rashi (Sefer Haterumot 19). See Maimonides, Mishneh Torah Shechitah 11:11, where he quotes the prevalent custom in Spain and North Africa is not to inflate the lungs unless there is a reason to do so. I asked whether one should be concerned about the stringent opinion or not.