Question

1. can a criminal face charges at both the state and federal level for a single crime?

possibly, as long as the charges are different at each level.
yes, they can face the same charges at the state and federal level.
no, the supremacy doctrine means the federal agencies get to rule alone.
no, a person cannot face multiple trials for a single crime.

Explanation:

In the United States, the dual - sovereignty doctrine allows a criminal to be charged at both state and federal levels. This is because the state and federal governments are considered separate sovereigns. The Double Jeopardy Clause of the Fifth Amendment (which protects against multiple prosecutions by the same sovereign) does not apply across different sovereigns. So, even if the crime is the same in essence, as long as the charges are based on the laws of different sovereigns (state and federal), it is possible.

Answer:

Possibly, as long as the charges are different at each level.