I'm not sure why I find the missing citation so funny (probably because the claim is pretty surprising), but I laughed really hard and up-voted you in case it was a joke and not a mistake.
The Sixth Amendment says in a criminal trial the defendant has a right to a trial by a jury from the State and district where the crime was committed.
The problem is that all of Yellowstone is in the District of Wyoming, including the 50 square miles that is in the State of Idaho. Hence, the jury must consist of people that are from that 50 square mile region of the park and state.
The permanent population of that region is 0, and it is a part of the park that is rarely visited so the transient population is close to 0.
No jury can be impaneled for your trial, and without a trial, you cannot be convicted.
Here's the link - http://www.vox.com/2014/5/22/5738756/you-can-kill-someone-in...