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Okay, no leather shoes for Yom Kippur (or Tisha B'Av). I always assumed if the label said ALL MAN MADE MATERIALS or 100% CANVAS or something like that, that we could trust the label. (Would they really sneak leather in? It's more expensive, right?) Has anyone asked/heard anything about this?

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If it works for Chalov AKum I would Imagine It works Here too.

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Certainly the logic of "trust in economics and regulation" would apply here; R' Moshe's heter for milk goes beyond that, that "knowing" counts as "seeing" with regards to the enactment on milk. For general kashrus, "knowing" is enough. So if we can apply a kal vachomer from food kashrus (and I'm correct on the metzius), should be fine. –  Shalom Aug 19 '10 at 22:26
    
@Shalom Just to correct a misconception R' Moshe's heter for milk is not based on that, it was based on the government testing that was done on milk. These days the testing is not done, so those who drunk Chalov Akum are not relying on him, but rather on later opinions. oukosher.org/index.php/common/article/… –  Ariel Jul 15 '12 at 4:40
    
@Ariel let's just say it's more complicated than that. R' Moshe has a series of responsa about the subject, and interpreting them is still being fought over today. –  Shalom Jul 16 '12 at 6:02

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