Comparative Law

Online
Essay
Constitutional Amendment by State Statute? The Case of Dual Sovereignty in Illinois
Luke Henkel
J.D. candidate at The University of Chicago Law School, Class of 2026.

Thank you to Tyler Ashman and Liam Haffey for providing helpful feedback and assistance on this Case Note.

The Constitution’s Double Jeopardy Clause allows successive criminal prosecutions for the same conduct so long as they are pursued by separate sovereigns (such as two different states). This Case Note examines Illinois law to argue that state statutes are a useful, though imperfect, means of addressing the dual sovereignty doctrine. It argues further that the details of statutory language are highly consequential to whether states can scale back dual sovereignty in practice.