The Supreme Court’s Loper Decision Closes the “Future‑Sentence” Loophole in the First Step Act

Why the Loper ruling matters for every criminal defense attorney

On May 28, 2026, the United States Supreme Court issued a 6‑3 opinion in United States v. Loper, 597 U.S. ___ (2026), holding that federal judges may not grant a sentence reduction merely because the statutory maximum for a crime has been lowered since the defendant’s original sentencing. The decision narrows the scope of the First Step Act’s compassionate‑release provisions and forces practitioners to rethink the timing and strategy of § 3582(c) petitions.

The statutory backdrop

The First Step Act of 2018 amended the Sentencing Reform Act to create a “compassionate release” mechanism under 18 U.S.C. §§ 3582(c)(1)(A) and (B). The statute allows a court to “reduce a term of imprisonment” when the inmate “has a terminal illness” or “other extraordinary and compelling circumstances” exist, or when the “lawful sentence” that the inmate is serving is “greater than the term of imprisonment that would be imposed if the offense were committed today.” The latter clause—often called the “future‑sentence” provision—was the focal point of Loper.

The Court’s reasoning

Justice Thomas, writing for the majority, stressed that the First Step Act’s language “presupposes a lawful sentence that is fixed at the time of sentencing.” The Court rejected the lower‑court view that a judge could look forward to a statutory amendment and retroactively apply the new, lower maximum. “A sentence is a legal determination of the appropriate punishment for a conduct that occurred at a particular point in time,” Thomas wrote. “It cannot be undone simply because Congress later decides that the same conduct warrants a lighter penalty.”

The dissent, authored by Justice Kagan, warned that the decision “undermines the very purpose of the compassionate‑release reform—namely, to give courts flexibility to account for changing standards of punishment and the humanitarian concerns that flow from them.” The split underscores a deeper philosophical clash: whether sentencing should be strictly historical or dynamically responsive to evolving policy.

Practical impact on compassionate‑release practice

1. No more “future‑sentence” petitions based on statutory reductions. Defense counsel can no longer file a § 3582(c)(1)(B) motion solely on the ground that the statutory maximum for the underlying offense has been lowered since sentencing. The decision effectively eliminates a low‑hanging‑fruit avenue that many practitioners relied upon after the First Step Act’s enactment.

2. Heightened emphasis on the “extraordinary and compelling circumstances” prong. With the “future‑sentence” gateway closed, the only remaining statutory path is the medical‑or‑humanitarian prong. Lawyers must now invest more resources in gathering medical records, psychological evaluations, and family‑hardship evidence to meet the rigorous standard articulated in United States v. Santos, 540 U.S. 125 (2004) (the “extraordinary and compelling” test). The Court in Loper noted that courts “must apply a rigorous, case‑by‑case analysis” when evaluating such petitions.

3. Re‑evaluation of sentencing‑reduction strategies. Prosecutors and judges may be less inclined to entertain “sentence‑reduction” motions that hinge on changes in statutory maxima, knowing that appellate courts will now likely reverse them. This may lead to a modest increase in sentence‑length stability, but also to a potential rise in appeals challenging the First Step Act’s remaining compassionate‑release provision.

What this means for sentencing law

The Loper decision resurrects the “fixed‑sentence” doctrine that the Sentencing Reform Act has long championed. By anchoring a sentence to the law as it stood at the time of sentencing, the Court restores predictability for both prosecution and defense. However, it also re‑opens the debate over whether the First Step Act should be amended to explicitly allow retroactive application of statutory reductions—a legislative fix that some members of Congress are already discussing.

For practitioners, the immediate takeaway is clear: do not file a “future‑sentence” compassionate‑release motion unless you can also satisfy the medical or humanitarian prong. Moreover, attorneys should counsel clients early about the limited window for seeking compassionate release, emphasizing the importance of documenting any qualifying health conditions as soon as they arise.

Potential downstream effects

1. **Increased litigation over § 3582(c)(1)(A) petitions.** With the “future‑sentence” route off the table, courts are likely to see a surge in challenges to the adequacy of the “extraordinary and compelling” standard, prompting a new wave of appellate decisions that will further shape the doctrine.

2. **Legislative response.** Senators Cory Booker (D‑NJ) and John Cornyn (R‑TX) have already introduced bipartisan language to clarify that statutory reductions may be considered “extraordinary and compelling” when they reflect a substantial shift in societal views on punishment. If enacted, that amendment would effectively overrule Loper’s interpretation.

3. **Impact on prison administration.** The Bureau of Prisons (BOP) will need to adjust its internal guidelines for reviewing compassionate‑release requests, removing the “future‑sentence” metric from its decision‑making matrix. This may streamline the review process but also places greater burden on medical‑review staff.

Conclusion: A call to adapt

The Supreme Court’s ruling in United States v. Loper is a decisive rebuke of the “future‑sentence” loophole that many defense attorneys hoped would become a routine weapon for securing early release. While the decision restores a degree of sentencing certainty, it also narrows the humanitarian toolkit available to inmates. Criminal defense practitioners must now pivot toward robust, evidence‑driven petitions under the medical‑or‑humanitarian prong, and policymakers should consider whether legislative clarification is needed to preserve the compassionate spirit of the First Step Act.

“A sentence is a judgment about past conduct, not a forecast of future legislative trends.” – Justice Thomas, United States v. Loper, 597 U.S. ___ (2026).