Commentary for Avodah Zarah 78:3
ורב מ"ש גבינה דלא טרח ומזייף חלב נמי לא טרח ומזייף אמר רב כהנא אפיק חלב ועייל חתיכת דג שאין בה סימן
And to Rav why is cheese different, in that [the non-Jew] would not take the trouble to commit a fraud [and allows one seal]; likewise with milk he would not take the trouble to commit a fraud [and yet Rav demands two seals]? R. Kahana said: Strike out the word “milk” and insert “a piece of fish” which has no distinguishing mark.
Daf Shevui to Avodah Zarah
Rav says that cheese only needs one seal but milk requires two seals. Why the difference? R. Kahana affirms that there really should be no difference between the two and therefore allows milk with only one seal. He does not allow pieces of fish with one seal less the non-Jew switch the kosher fish with non-kosher one. Two seals will make this impossible.
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