The First Step Act’s Hard Stop: Why the Supreme Court Just Gutted the Sentencing Disparity Loophole

The Death of the Backdoor Retroactivity Playbook

For the past eight years, federal defense attorneys have relied on a procedural backdoor to rescue clients from draconian, outdated prison terms. When Congress passed the First Step Act of 2018, Pub. L. No. 115-391, 132 Stat. 5194, it fundamentally altered the mechanics of compassionate release under 18 U.S.C. § 3582(c)(1)(A). By allowing defendants to bypass the Bureau of Prisons and petition federal judges directly, the Act sparked a wave of creative post-conviction lawyering. The most effective tactic? Arguing that a massive disparity between a defendant’s original sentence and the sentence they would receive under current law constitutes an "extraordinary and compelling" reason for early release.

This June, the Supreme Court slammed that backdoor shut.

In a highly anticipated ruling, the Court held that federal judges cannot order early release solely because a prisoner would receive a shorter sentence under subsequent changes to criminal law. The decision resolves a simmering, years-long circuit split and hands a massive victory to the Department of Justice, which has relentlessly argued that defendants should not be allowed to use compassionate release to bypass Congress’s explicit decisions not to make certain sentencing reforms retroactive.

Why the DOJ Fought So Hard

To understand why this ruling is a seismic shift for federal practice, you have to look at the math. Prior to recent reforms, prosecutors routinely stacked charges—particularly firearm enhancements under 18 U.S.C. § 924(c)—to secure mandatory minimum sentences that effectively amounted to life without parole. When Congress later amended these statutes to eliminate mandatory stacking, it deliberately chose not to apply the changes retroactively to already-sentenced prisoners.

The defense bar’s workaround was brilliant in its simplicity: If a client is serving 50 years for conduct that would only trigger a 15-year sentence today, that 35-year gulf is objectively "extraordinary and compelling." Several federal circuits agreed, allowing district judges to use their discretion to right historical sentencing wrongs.

But the DOJ viewed this as an unconstitutional end-run around legislative intent. By ruling in the government's favor, the Supreme Court has reaffirmed a strict textualist approach to federal sentencing statutes. If Congress wants a sentencing reduction to apply retroactively, the Court reasoned, Congress must explicitly write retroactivity into the statute. Federal judges cannot use the equitable safety valve of § 3582(c)(1)(A) to override legislative finality.

The Word "Solely" is Now the Defense Bar’s Best Friend

While the ruling is undeniably a heavy blow to post-conviction advocates, it is not a total death knell for compassionate release. The Supreme Court’s holding was notably precise: judges cannot grant release solely based on a subsequent change in sentencing law.

"The defense bar must immediately pivot from relying on the 'sentencing disparity' as the anchor of a compassionate release motion. The disparity is no longer the steak; it is merely the seasoning."

This leaves a narrow, heavily contested window open for what practitioners are already calling "Disparity Plus" arguments. If a non-retroactive change in the law cannot be the only reason for early release, can it still be considered as part of the totality of the circumstances? The text of the Court’s ruling suggests it can, provided there are other independently compelling factors.

For practicing attorneys drafting § 3582 motions tomorrow morning, the strategy must fundamentally change:

• Stop leading with the law change: Petitions that frame the legislative sentencing disparity as the primary injustice will now face immediate, boilerplate motions to dismiss from federal prosecutors citing this June ruling.
• Build a robust "Totality" package: Defense counsel must dig deeper into the client’s institutional file. Exceptional rehabilitation, severe medical decline, age-related vulnerabilities, or the incapacitation of a family caregiver must now take center stage.
• Use the disparity as a multiplier: Once you have established an independent medical or family-based reason for release, use the sentencing disparity to tip the equitable scales. The argument shifts from "Release him because the law changed" to "Release him because his health is failing, and keeping him incarcerated serves no penological purpose given that Congress no longer mandates this sentence."

The Road Ahead for Federal Sentencing

The Supreme Court’s decision marks a definitive end to the Wild West era of First Step Act litigation. For years, a defendant’s chances of securing a sentence reduction depended almost entirely on the circuit in which they were convicted—a geographic lottery that undermined the uniformity of federal criminal law.

By enforcing a strict interpretation of § 3582(c)(1)(A), the Court has restored uniformity, but at a steep human cost. Thousands of federal inmates serving sentences that Congress itself has deemed overly punitive are now locked out of their most viable path to freedom. For the defense bar, the mandate is clear: the easy arguments are gone. Securing compassionate release in a post-2026 landscape will require a return to aggressive, fact-intensive mitigation work, demanding that lawyers prove their clients' extraordinary circumstances the hard way.