There is a concept of "Eid echad ne'eman b'issurin" which means if a person testifies on something that is questionable we believe him. An example would be regarding kosher: if I go to a friend's house and he serves me chicken, and he tells me it's kosher, I'm allowed to take his word for it. So if a restaurant owner is an observant Jew, must he have a kosher certificate?
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