I love reading Montana newspapers. Today's Missoulian has an article entitled "Helena man reassembles five $100 bills eaten by dog". (The article notes that the dog ignored a $1 bill; apparently it didn't taste so good.) The man reassembled the bills after picking the pieces out of subsequent piles of dog poop. Local banks refused to accept the washed, reassembled, and taped-together bills, and eventually he was told to submit them to the government, where, according to (for instance) the website of the Bureau of Engraving, US Department of the Treasury, each case of damaged currency "is carefully examined by an experienced mutilated currency examiner". I infer that non-mutilated people don't get any experience as currency examiners.