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Does one need a hechsher on commercially available bagged lettuce? Or is the standard washing process used by the producers sufficient to remove all insects of halachic significance?

Anecdotally, I've noticed that a few Chabad Houses I am familiar with use bagged lettuce without a hechsher and do not check it themselves. When asked, they told me that their custom was not to be "machmir" about the issue of bugs. I assume that means they rely on the view of the Aruch HaShulchan YD 100:13 who provides a limmud zechus for "all the masses of Jews who are not careful (to check) and eat anything that comes into their hands as long as they don't see any obvious infestation, and Heaven forfend to say that all the Jews are stumbling in a great sin like this"

Are there sources for the leniency to rely specifically on commercial washing without a sampling-based hechsher? Or is the Aruch haShulchan really the primary basis for leniency? Are there contemporary poskim who are lenient?

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When does the Aruch Hashulchan apply? I've heard that when an infestation is found, its pretty obvious- but they're only found in certain harvests. Does that mean that lettuce overall has no obvious infestation? – Baal Shemot Tovot Jun 18 '12 at 21:11
Also make sure to separate Terumot and Maasrot as necessary if there is no Hechsher. – Double AA Jun 18 '12 at 21:48
related: judaism.stackexchange.com/questions/5397/… – Menachem Jun 18 '12 at 22:49
of interest: star-k.org/kashrus/kk-BugsRevisited.htm <-- background halachot and explanation of how the Star-K certifies lettuce – Menachem Jun 18 '12 at 22:52

According to the CRC-Chicago iceberg lettuce that is prewashed may be used without hashgacha and without any further washing.

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What about further checking?? – SAH Jul 3 at 17:31

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