Al-Kafi is a respected book in the views of Shia scholars, but we cannot guarantee that all the narrations mentioned in it are authenticated, as one should refer to the experts to determine the authenticity of each narration.
If one knows that the death of the animal was a result of the slaughtering process, it is permissible to consume. Otherwise, it is not permissible to consume.
Yes, it is Tahir.
It is prohibited to sell wine, even indirectly or by acting on behalf of the company.
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