Skip to main content
Illustration for Lewis v. United States
Docket 19-8401

Lewis v. United States

This case asks whether the First Step Act's definition of a felony drug offense changes how sentence enhancements are applied under the Armed Career Criminal Act. It also questions whether the Armed Career Criminal Act is unconstitutionally vague due to unclear definitions.

Status
Decided
Appeal from
United States Court of Appeals for the Fourth Circuit
Decision released
Jun 1, 2020

Decision briefing

The case in plain English

Start with the holding, why it matters, and the strongest takeaways from the opinions.

What Happened

The Supreme Court was asked to decide if new definitions in the First Step Act change how sentences are increased under the Armed Career Criminal Act. The case also looked at whether the Armed Career Criminal Act is too vague because it does not clearly define what counts as separate convictions.

Why It Matters

This case affects how long people stay in prison for certain drug and gun crimes. If the law is found to be vague, many people currently serving long sentences could ask for their prison time to be reduced.

The Big Picture

The First Step Act was passed to make the justice system fairer and reduce long prison stays. This case is part of a larger debate over whether old sentencing laws are clear enough for people to follow.

What the Justices Said

No substantive justice or advocate reactions are available yet.

The Bottom Line

The Court is reviewing whether federal sentencing laws are clear enough to be used to increase prison time.

What's Next

Legal experts will watch how lower courts and government agencies respond to the ruling. The decision will determine if certain prisoners can apply for shorter sentences based on the new definitions.

What is the core dispute in this case?

The dispute is whether new drug definitions in the First Step Act apply to older sentencing laws. It also asks if the Armed Career Criminal Act is unconstitutionally vague.

What are the real-world consequences of this ruling?

The ruling could change the length of prison sentences for many federal defendants. It specifically impacts those with multiple past drug or firearm convictions.

What legal rule is being examined by the Court?

The Court is examining the definition of a 'serious drug offense.' It is also looking at the constitutional requirement that laws must be clear rather than vague.

What is the next procedural step for this case?

Lower courts must now apply the Supreme Court's guidance to similar cases. Affected parties will likely file motions to have their sentences reconsidered.

How does this case fit into a broader trend?

This case follows a trend of the Court reviewing mandatory minimum sentences. It reflects ongoing efforts to clarify how different criminal justice reform laws work together.

Where things stand

Timeline

Key court milestones at a glance.

Case Accepted
Arguments AheadUpcoming
Decision ReleasedJun 1, 2020

Source note

How this page is sourced

Official case materials anchor this page. Reporting is used only to add context and explain the dispute in plain English.

Page data last refreshed Mar 31, 2026.

Primary materials

Documents & resources

Briefs, opinions, transcripts, and audio when they are available.

Recent coverage

In the news

Selected reporting and analysis that can help you follow the public conversation around the case.

More to watch

Related cases on the docket

Other live cases with a similar posture, so readers can move across the docket without losing the thread.