The Supreme Court ruled that the federal government cannot restrict gun ownership based solely on marijuana use, narrowing a law that banned drug users from possessing firearms. The decision limits the power of federal authorities to disarm individuals who use cannabis, particularly as marijuana laws have evolved across states.

The ruling addresses the intersection of Second Amendment rights and federal drug policy at a time when marijuana has been legalized or decriminalized in many states, even as it remains illegal under federal law. The court determined that casual or state-legal marijuana use does not automatically justify stripping someone of their constitutional right to bear arms.

The decision will affect how federal background check systems handle gun purchases by individuals who may use marijuana in states where it is legal. Federal forms currently require gun buyers to attest they are not unlawful users of controlled substances, including marijuana. The court's ruling suggests this standard may need revision to account for state-level marijuana legalization and distinguish between different levels of drug use.

The case represents another expansion of gun rights following recent Supreme Court decisions that have broadened Second Amendment protections. It also highlights ongoing tensions between state and federal drug laws, particularly as more states move to legalize marijuana for medical or recreational use while federal prohibition remains in place.

The ruling will require federal agencies to reassess how they apply gun ownership restrictions in cases involving marijuana use. It may also prompt further legal challenges to other provisions of federal gun laws that restrict ownership based on drug use or other factors.