The Supreme Court heard the Food and Drug Administration's (FDA) appeal in Food and Drug Administration v. Wages and White Lion Investments, LLC on Monday. The case concerns the FDA's requirement for scientific studies to approve premarket tobacco applications (PMTAs) for flavored electronic cigarette (e-cigarette) manufacturers and distributors.

Makers of flavored e-cigarettes brought various cases challenging the FDA’s decision to refuse approval and alleged the agency changed its standards of evaluation on short notice. NBC News’ Lawrence Hurley reports why the court,