I thought it was already proven the Feds can prosecute a crime for the same circumstances a defendant was found Not Guilty of in state courts? I'm thinking specifically of the Police who beat Rodney King. Their acquittals in state court caused riots in LA, Bush the Elder tried them in Federal court to quell the mobs, and it was upheld.
If the Feds can do it to the states, then the states can do it to the Feds.