From the SCOTUS Blog. This is big news. Anyone who gets a pardon from Trump can still be prosecuted on similar state charges.
In Gamble v. United States, #SCOTUS reaffirms “separate sovereigns” exception to Constitution’s double jeopardy clause; ruling means that federal and state governments can prosecute defendant for same conduct without violating Constitution
— SCOTUSblog (@SCOTUSblog) June 17, 2019
Some commentators had thought that a court might take a knife to what’s called the separate sovereign exemption where courts have ruled that state and federal governments are two distinct groups and that trying someone for similar crimes in both places would not violate the double jeopardy clause of the 5th Amendment to the US Constitution.
But the context here is that if the court ruled that this could be double jeopardy then you had the possibility of Trump issuing pardons that would cover federal law and this clearing you for being tried in state courts. But with the opinion of Justice Alito that will not happen.
Haven’t read the whole opinion but it was a 7-2 decision, with an unusual pair of Ginsburg and Gorsuch dissenting.