The Supreme Court will hear United States v. Hemani on March 2, examining whether Congress can criminalize gun possession by 'unlawful users' of marijuana. This marks the Court's second major Second Amendment case of the current term, following its controversial 2022 Bruen decision that established a historical tradition test for gun laws.

Legal experts note the case presents unique challenges, as federal appeals courts have struggled to define what constitutes an 'unlawful user' of marijuana. The law's vagueness raises constitutional concerns about due process, with courts reaching divergent conclusions about whether occasional users or one-time users can be barred from gun ownership. The Trump administration has argued for upholding the ban.

The case offers justices an opportunity to avoid the complex historical analysis required by Bruen. Instead, they could strike down the law on vagueness grounds, as federal judges cannot agree on a definition of 'unlawful user.' This approach would allow the Court to resolve the case without wading into the murky waters of Second Amendment jurisprudence that has left lower courts struggling to apply the Court's shifting precedents.