Class actions
Given the presumption in favor of Federal jurisdiction, where the pleadings state a claim that involves a larger class than the currently constituted class, the party contesting removal under the CAFA local controversy exception bears the burden of establishing that a sufficient percentage of the class vindicated by the claim is from a given state.
Dissent - No presumption in favor of federal jurisdiction; pleadings should be construed under state rules, which allow for a more liberal notice of claim, and therefore might conceivably limit the class to those presently involved.
http://www.ca5.uscourts.gov/opinions/pub/15/15-10955-CV0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.