Does federal criminal immunity provide protection against state criminal charges?

Federal criminal immunity does not provide protection against state criminal charges. The principle of dual sovereignty allows both the federal and state governments to prosecute individuals for the same conduct, as they operate independently in their respective jurisdictions. Therefore, even if someone has immunity from federal prosecution, they can still be charged and prosecuted by the state for the same actions.

It's important to understand that federal immunity is typically a protection against federal prosecution only, not state-level prosecution. Only specific agreements or statutes might provide different protections, but those would not be part of the general federal immunity principle. Hence, federal immunity does not extend its protective mantle to charges brought by state authorities.