The phrase "fruit of the poisonous tree" in justification of the exclusion of evidence from a court proceeding, has long been one of my favorite bits of legalese. Now there is a book on the pre-history of the term. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4385356 When I was a practicing lawyer I was always hoping I'd have a reason to write a brief on the subject. It never happened. I won't actually cry over that long-spilt milk, but I will post the appropriate emoticon in lieu of actual tears. See above.