Reference for Chullin 186:46

אין הטבחין נאמנין [וכו']:

If we are speaking of a place where they do not proclaim it,<span class="x" onmousemove="('comment',' Sc. that an animal was found to be trefah. This is the custom where all the butchers are Jews. Where the practice of announcing it is not in vogue, there Jews are not allowed to buy meat from gentiles under any circumstances, for the Jewish butchers may have disposed of the trefah animal to a gentile and did not trouble to make this fact known.');">²³</span>

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