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Say I visit a bakery, restaurant, jail, hospital, or nursing home. And say I already know that the food there is kosher. Must I still check the kashrut certificate every time I visit?

(Gershon Gold, thank you for inspiring this question.)

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Related: judaism.stackexchange.com/questions/8949. – msh210 Feb 1 '12 at 7:21
up vote 5 down vote accepted

Generally (at least here in Israel) they have it on display so generally I would think just noticing that it is still there and not expired should be OK.

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Every certificate I have ever seen has a date on it. You only need to check the teudah Kashrut(Kosher certificate) once per date range.

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Do you have a source? I think it would be reasonable to argue that either the assumption that the food is permissible generally applies, regardless of how far into the date range you are, or that the assumption never holds so you need to check on each visit. – WAF Aug 14 '14 at 13:14

The certificate can be revoked without your knowledge at any time, so I would say you should check it each time, and make sure the the dates is still good.

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If it's revoked, can't the restaurant still have a photocopy of the old one posted? How does it help to check? – msh210 Jan 6 '13 at 6:32
Theoretically I suppose they can, but legally they cannot. – andrewmh20 Jan 6 '13 at 19:30
@andrewmh20: +1. Still, I'm curious. What law says they cannot post a photocopy of the revoked certificate? – unforgettableid Jan 14 '13 at 1:20
As far as I am aware, the kashrut companies always own the certificate, and are licensing it to be posted in an establishment they approve of, with the condition that it must be removed if the kashrut company says so. – andrewmh20 Jan 15 '13 at 0:26

You should check that the Kashrus certificate is available and not expired, each time you go.

Many of the kashrus agencies now have signature stamps AND holographic stickers on them to ensure that it's not a photocopy.

For example, see information about Badatz Beit Yosef with a picture of one of their teudot kashrut.

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