WASHINGTON — Marijuana users scored a major U.S. Supreme Court victory Thursday as the justices ruled unanimously that the federal government cannot automatically make it a crime for someone to own a gun simply because they use marijuana.
The 9-0 decision in United States v. Hemani is a major ruling at the intersection of marijuana law, gun rights and criminal justice. It could also offer new legal ammunition for some defendants and inmates facing firearm charges tied to marijuana use.
The case involved Ali Danial Hemani, a Texas man who used marijuana and kept a firearm secured in his home. He was charged under a federal law that bars unlawful users of controlled substances from possessing guns.
Marijuana remains illegal under federal law, even though many states now allow medical or recreational use. That legal conflict has put millions of Americans in an uneasy position: lawful or tolerated marijuana use under state law can still create federal problems when guns are involved.
The Supreme Court said the government went too far by treating marijuana use alone as enough to strip a person of Second Amendment rights and expose them to a felony prosecution.
The ruling does not give every drug user a free pass to carry guns. The Court left room for prosecutions involving people who are intoxicated while armed, addicted, dangerous or otherwise shown to pose a specific risk.
But the decision rejects the government’s broad theory that marijuana users can be categorically treated as too dangerous to possess firearms.
For weed smokers, it is a big win.
For federal prosecutors, it is a warning shot.
And for people already convicted or incarcerated under similar facts, the ruling could trigger a fresh round of legal challenges, appeals and sentence-review efforts, though relief will likely depend on the facts of each case and how lower courts apply the decision.
The American Civil Liberties Union, which represented Hemani along with other lawyers, celebrated the ruling as a victory for both marijuana users and constitutional rights.
The ACLU said Hemani was charged with a felony because he recreationally used marijuana while also owning a firearm that was safely secured in his home. The group argued that the federal statute allowed the government to arbitrarily discriminate against marijuana users and deprive them of a fundamental constitutional right.
The decision could affect a large number of Americans because marijuana use is now widespread. Nearly half of Americans report having used marijuana at some point in their lives, and state-level legalization has continued to expand even while federal law lags behind.
That disconnect has created a legal mess. A person may be treated as a lawful cannabis consumer under state rules, but still be classified as an unlawful drug user under federal firearm law.
Thursday’s ruling does not solve every conflict between state marijuana laws and federal drug law, but it does say the government cannot use marijuana use alone as a shortcut to criminalize gun ownership.
The case also carries political irony. Gun-rights advocates, marijuana reformers and civil-liberties groups all found common ground in arguing that the government’s blanket approach was too broad. That unusual coalition reflected how strange the law had become: a person could legally or openly use marijuana in many states, but risk a federal felony for also owning a firearm for self-defense.
The Supreme Court’s ruling builds on recent Second Amendment decisions requiring gun restrictions to be consistent with the nation’s historical tradition of firearm regulation. The government had argued that historical restrictions on intoxicated or dangerous people supported the modern drug-user ban. The Court found that argument was not enough to justify an automatic ban based on marijuana use alone.
The decision is also likely to raise questions about past prosecutions.
People convicted solely because they used marijuana and possessed a firearm may ask courts to reconsider whether their convictions can stand. However, cases involving other drugs, addiction, violence, gun misuse, intoxication or other criminal conduct may not benefit in the same way.
Still, the ruling sends a clear message: the federal government cannot lump all marijuana users together as dangerous criminals and then take away their gun rights without a stronger showing.
For marijuana users who also value the Second Amendment, the decision is one of the biggest legal wins yet.
It also adds pressure on Congress and federal agencies to clean up marijuana law, which remains stuck between old federal prohibition and modern state-level legalization.
The bottom line from the Court is simple: using marijuana does not automatically erase the Constitution.