Popular television shows portray death investigators as high-tech sleuths wielding the most sophisticated tools of 21st century science. An unprecedented collaborative investigation by FRONTLINE, ProPublica and NPR found a very different reality: A dysfunctional system in which there are few standards, little oversight and the mistakes are literally buried. In state after state, reporters found autopsies -- our final physical exam -- conducted by doctors who lacked certification and training. An increasing number of the 2.5 million Americans who die each year go to the grave without being examined at all.