יד

שׁוֹחֵט, שֶׁהֵעִיד עָלָיו עֵד אֶחָד שֶׁשָּׁחַט שֶׁלֹּא כַּהֹגֶן, וְהוּא מַכְחִישׁוֹ, עֵד אֶחָד בְּהַכְחָשָׁה לָאו כְּלוּם, וְהָעֵד עַצְמוֹ מֻתָּר לֶאֱכֹל מִכָּאן וּלְהַבָּא. וּמִכָּל מָקוֹם, הַכֹּל לְפִי מַה שֶּׁהוּא אָדָם.

 

Seif 14

 

Concerning a slaughterer that one witness (alone) testified that he performed an improper slaughter, and he (the shochet) denies this, we say that "one witness who is contradicted by denial is nothing", and even the witness himself is allowed to eat from this shochet in the future.  However, in any event, all of this depends on the stature of the man in question. (both the witness and the shochet?)