[Avodah] Kasheh lvarrer

[Rich, Joel]

I was listening to an OU shiur on kashrut in which R' H Schachter
mentioned that the reason we don't x-ray cows to ensure they're not
treifot (and thus can drink their milk) was because this was kashe
lvarrer (it was an offhand remark-not the focus of the shiur).  I know
there is a tshuvah (I think it was the minchat Yitzchak) who was asked
about setting up a "hashgacha" of this type and he basically dismissed
it out of hand (I can find it if anyone is interested).  Yet at the same
time we seem concerned (except for the Rosh) enough not to eat all 3
pieces of meat when we know one was treif even though it's batel brov.
On the other hand we don't inspect for certain treifot because they're
not common even though in theory we could be mvarrer.(not sure how
"kashe")
 
It occurred to me that the difference might be in one case we know a
treifa existed (it's a dita kamman) where in the other we don't know
(it's dleta kamman even though statistically likely)
 
Has anyone heard of any detail on kashe lvarrer (versus a miut sheino
matzui etc.)
 
KT
Joel Rich
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