The Supreme Court struck down a law banning drug users from owning firearms, a win for gun owners and marijuana users.

• The justices ruled unanimously that banning "habitual" drug users from owning guns clashes with the Second Amendment.
• The case involved a Texas man caught with marijuana and a Glock; his lawyers said his gun rights were violated.
• The ruling means people like Hunter Biden, prosecuted for lying about drug use on a gun form, would not have broken the law.
• About 15% of Americans use marijuana monthly, so the old law touched a large group.
• It's unclear if the ruling covers harder drugs like cocaine or fentanyl, which lower courts will have to sort out.

Outlook: Expect legal fights over whether this protection extends beyond marijuana to other drugs.