Didn’t exactly learned this “today” but the first time I heard of this, I was kinda surprised at this fact. I thought y’all should know since there is a case in the news that people are calling for Jury Nullification or Pardons. That could get a bit tricky considering this Dual Sovereignty Doctrine.
Not a lawyer, but I don’t think the murderer crossing state lines matters. The murderer kidnapping the victims, crossing state boarders, and then killing does.
I presume attacking across the boarder would also count.