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Looking to help out Prof. David Bernstein, in this comment.

I've heard that kashrut certification organizations require meat restaurants to have a mashgiach supervising operations at all times. What is the source for this requirement? (I find it unlikely that the early Halachic sources address the case of a restaurant under rabbinic supervision, as this is a fairly recent invention.)

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Eid echad neman bissurin. – sam Jul 29 '13 at 17:01
@sam, that perhaps establishes the efficacy of this tactic, but not a requirement for it. – Isaac Moses Jul 29 '13 at 17:07
I meant not necessary at all as long as the owner is a Jew. – sam Jul 29 '13 at 17:25
related: judaism.stackexchange.com/questions/5771/… – Menachem Jul 29 '13 at 17:42
Related: judaism.stackexchange.com/q/10732/5 – Seth J Jul 30 '13 at 13:54
up vote 2 down vote accepted

Shulchan Aruch Yorah 63:1 tells us that the Rabbis decreed that any meat that has been out of eyesight of the Jew (even in his own house) is forbidden unless it has a sign on it, or the person can definitely recognize it. If it is wrapped and sealed it is not a problem.

This is based on Rambam, Hilchot Ma'achalot Assurot 8:11, which in turn is based on Chulin 95a.

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Ha, I was wrong. This is why I need to have a better knowledge of kashrut. – rosenjcb Jul 29 '13 at 18:47
But AFAIK Ashk'nazim forbid it only if it was entrusted to a non-Jew (not if it was merely out of a Jew's sight). That's relevant, too, in a restaurant, but bears mentioning. – msh210 Jul 30 '13 at 5:57
@msh210: Are you referring to the Ramah in 63:2 - hebrewbooks.org/pdfpager.aspx?req=9145&pgnum=275 -? If so, that seems like a very specific heter only if it found in the same place he left it and only kosher meat was sold in the area. (and in that case, even if it was in the hands of a non-jew it is still ok) – Menachem Jul 30 '13 at 6:17
I'm not sure whether that's the source (though it looks like it), but what I wrote is the halacha as I understand it. (And I see I made the same claim elsewhere.) See also judaism.stackexchange.com/q/5771. Of course CYLOR for practical guidance. – msh210 Jul 30 '13 at 16:13

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