Let's imagine Daniel and Henry are vacationing in Yellowstone National Park, and set up camp in the 50 square miles of the park that are in Idaho (unlike most of the park, which is in Wyoming). They get into a fight and Daniel winds up killing Henry. But rather than bury the body and try to cover up the crime, Daniel freely admits to it and surrenders himself to the authorities.

At his trial, he invokes his right, under the Sixth Amendment, to a jury composed of people from the state where the murder was committed (Idaho) and from the federal district where it was committed. But here's the thing — the District of Wyoming has purview over all of Yellowstone, even the parts in Montana or Idaho. So Daniel has the right to a jury composed entirely of people living in both Idaho and the District of Wyoming — that is, people living in the Idaho part of Yellowstone. No one lives in the Idaho part of Yellowstone. A jury cannot be formed, and Daniel walks free.
http://www.vox.com/2014/5/22/5738756...-get-away-scot