Reference for Chullin 6:2
אבל לא בדק ונתן לו לא ישחוט ואם שחט בודק סכינו אחריו נמצאת סכינו יפה מותר לאכול משחיטתו ואם לאו אסור לאכול משחיטתו
But if the knife was not prepared and given to him he may not slaughter.<span class="x" onmousemove="('comment',' It is assumed that a non-observant Jew (as defined) would slaughter according to ritual if a knife was prepared and given to him, but he himself would not take the trouble to prepare it.');"><sup>1</sup></span>
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