Emma Copley Eisenberg writes: “From reading up on the subject and talking to friends who had published books of nonfiction, I knew that I would be responsible for hiring and paying a freelance fact checker myself. This is the norm, not the exception; in almost all book contracts, it is the writer’s legal responsibility, not the publisher’s, to deliver a factually accurate text. As a result, most nonfiction books are not fact checked; if they are, it is at the author’s expense.”