The whole Patricia Cornwell-novel disclaimer is a little weird. Movies and books share titles often enough without inclusion of that kind of fine print, so it's odd that this disclaimer exists. But it is true that Patricia Cornwell was and is a best-selling novelist, known for a series of books starring medical examiner Kay Scarpetta, the second of which was also entitled "Body of Evidence." Although her books have not (yet) been made into movies, she seemed to be particularly "hot" as an author in the 1990s, so maybe at the time she was able to get that disclaimer in there so as not to confuse or complicate any movie potential being pursued for the Kay Scarpetta series.