Courts Still Fumbling Second Amendment Facts

The Supreme Court is deciding a Roundup cancer case — and the answer may reshape how courts handle the facts behind Second Amendment restrictions.

State of play: Two cases this term are forcing the justices to confront a problem they've been ducking since Bruen: when courts evaluate gun laws, who decides whether the underlying facts hold up?

• Monsanto v. Durnell asks whether a single jury can override a federal agency's scientific finding
• United States v. Hemani asks whether Congress can categorically disarm habitual marijuana users based on generalizations about drug users and violence
• Both hinge on what legal scholars call "legislative facts" — general claims about the world that drive legal rules, not just individual cases

The legal question: Bruen made historical facts the foundation of Second Amendment analysis. But modern-day factual claims matter too. Can Congress permanently strip someone's gun rights based on a category — drug user, domestic misdemeanant, nonviolent felon — without proving that this person is actually dangerous? Right now, different courts are answering that differently.

The intrigue: The term "legislative fact" sounds bureaucratic, but it's the thing doing the heavy lifting in nearly every Second Amendment case you've followed. Whether the government can disarm Zackey Rahimi because domestic abusers are dangerous. Whether it can disarm marijuana users because drug abusers are dangerous. These are factual claims. Congress asserts them. Courts have been accepting them at face value — or rejecting them — without consistent rules for how to test them.

"That's just the consequence of our civil jury system, where you have individual cases or controversies." — Ashley Keller, arguing for plaintiff John L. Durnell

What this means for Hemani: The government's argument for disarming daily marijuana users rests on a categorical judgment — that people who habitually abuse drugs pose a credible threat to others. Bruen and Rahimi together suggest the government can disarm people who are genuinely dangerous. But the factual bridge between "uses marijuana every other day" and "credible physical threat" has never been rigorously examined. The Court hasn't said who builds that bridge, or how strong it has to be.

Reality check: This isn't an abstract law school debate. If courts adopt a loose standard — Congress says drug users are dangerous, so we'll take their word for it — then the categorical logic applies just as easily to other groups. The same procedural sloppiness that lets the government disarm marijuana users without proof can be aimed anywhere.

What to watch: How the Court disposes of Monsanto v. Durnell will signal something about judicial appetite for overriding factual findings made outside the courtroom. If the justices defer heavily to the EPA's determination on glyphosate, gun-rights litigants may face the same deference applied to ATF and CDC findings in Second Amendment cases. Watch for that reasoning to migrate.