Some circumstantial evidence is very strong, as when you find a trout in the milk.

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Notes from Wikiquote

Referring to an 1849 dairyman's strike, during which there was suspicion of milk being watered down

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Attribution

Quote text and notes from Wikiquote: Henry David Thoreau (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.