How do we know E.Coli isn't in other produce?

I apologize if this question has already been asked in this way, but we all know grocery stores sell many varieties of "bagged" produce. If this E.Coli thing happened to [bagged] spinach, how do we know if our bagged lettuce is okay? How do we know the iceberg lettuce is okay, or the cucumbers, or the... show more I apologize if this question has already been asked in this way, but we all know grocery stores sell many varieties of "bagged" produce. If this E.Coli thing happened to [bagged] spinach, how do we know if our bagged lettuce is okay? How do we know the iceberg lettuce is okay, or the cucumbers, or the other produce? What I'm reading is that E.Coli can't be "washed away" by thorough cleaning (that's disturbing), so how do we protect ourselves and our families from consuming tainted produce before it is too late? (See, I always knew it was healthier eating Twinkies!!! Kidding, kidding). Thanks, friends.
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