Then I admit (probably my fault) to some confusion about your position. I won't quote you (this time), but I thought your point was that one act should not be considered a violation of different laws of different jurisdictions. That is, only one jurisdiction could prosecute for all the violations of its laws for any given act.
Again, apologies if I misunderstood.
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I'll try to explain my position more clearly.
I can understand that ELEMENTS of the same act might be crimes in different jurisdictions. The example I gave was hauling explosives across state lines and blowing up a building.
So it's murder to kill someone, but it's a federal crime to kill an FBI agent.
I don't have a problem with someone who is convicted of blowing up a building from being charged with murder, and with killing an FBI agent - two different crimes, two different jurisdictions, same act.
My problem comes from trying the same facts twice, after acquittal on those facts once.
If a jury found that the prosecution didn't prove that I committed the act, I should be done. The purpose of double jeopardy was so that they couldn't keep trying me. I understand they are different jurisdictions, but the facts remain the same.
What prevents a prosecutor from charging him with one murder at a time until he gets a conviction?