The last antecedent rule is a canon of legal interpretation that tells courts a modifying word or phrase at the end of a sentence applies only to the item it immediately follows, not to everything earlier in the list. If a statute refers to “cars, trucks, or motorcycles registered in this state,” the rule treats “registered in this state” as describing only motorcycles. Cars and trucks sit in the list without the geographic limit. The Supreme Court has called the canon a “timeworn” one and reached for it to resolve fights over statutory wording in disability law, federal sentencing, and consumer protection.
The rule reflects how people actually read. When a descriptive phrase sits at the end of a sentence, the eye attaches it to the nearest thing it could sensibly describe. Courts adopt that instinct as the default starting point, then test it against punctuation, sentence structure, and the surrounding statute before committing to a reading.
How the Rule Reads a Sentence
Take a contract clause covering “sales, marketing, or consulting activities within the metropolitan area.” Under a straight last-antecedent reading, the geographic restriction attaches to consulting alone. Sales and marketing stand unmodified, which may or may not be what the drafter actually intended. That is the practical bite of the rule: a restriction placed after one item in a list does not automatically spill backward onto the others.
Drafters who know this write around it. They repeat the modifier after each item, break the list into a tabulated structure, or move the modifier to the front of the sentence so there is no question which items it covers.
Barnhart v. Thomas
The Supreme Court’s 2003 decision in Barnhart v. Thomas is the case most often cited for the rule. The Social Security Act defines disability to mean a person cannot do their “previous work” and also cannot “engage in any other kind of substantial gainful work which exists in the national economy.” The dispute was whether “which exists in the national economy” reached back to modify “previous work” too, or only the phrase it directly followed.
The Court held that the limiting clause modified only “any other kind of substantial gainful work.” That meant the Social Security Administration did not have to prove a claimant’s prior job still existed in significant numbers nationwide before denying benefits. The Third Circuit’s broader reading was “precisely contrary to” the grammatical rule of the last antecedent.1Justia U.S. Supreme Court Center. Barnhart v. Thomas, 540 U.S. 20 (2003) The agency avoided a labor-market analysis for every claimant’s old job, and thousands of disability determinations became simpler.
Lockhart v. United States
The Court applied the rule again in 2016 in a federal sentencing case. The statute at issue imposed a ten-year mandatory minimum for child-pornography offenses when a defendant had a prior state conviction for “aggravated sexual abuse, sexual abuse, or abusive sexual conduct involving a minor or ward.” Avondale Lockhart argued that “involving a minor or ward” modified all three predicate offenses, so his prior conviction for sexual abuse of an adult would not trigger the enhancement.
The Court rejected that reading. “Involving a minor or ward” modified only “abusive sexual conduct,” the phrase it directly followed. The other two predicates stood on their own, with no age restriction built in. The majority explained that the canon “reflects the basic intuition that when a modifier appears at the end of a list, it is easier to apply that modifier only to the item directly before it,” particularly when carrying the modifier across every entry would require real mental effort.2Justia U.S. Supreme Court Center. Lockhart v. United States, 577 U.S. 347 (2016)
When the Rule Gives Way: The Series Qualifier Doctrine
The last antecedent rule has a competitor. The series qualifier canon says that when a modifier follows a parallel list of nouns or verbs that form a cohesive group, the modifier applies to the whole list, not just the last item. Courts switch to the series qualifier when attaching the modifier to only the nearest item would produce an awkward or nonsensical reading.
The 2021 case Facebook, Inc. v. Duguid is the clearest modern example. The Telephone Consumer Protection Act defines an autodialer as equipment with the capacity “to store or produce telephone numbers to be called, using a random or sequential number generator.” Noah Duguid argued the modifier attached only to “produce,” meaning a system that simply stored numbers from a list could qualify as an autodialer.3Supreme Court of the United States. Facebook, Inc. v. Duguid, 592 U.S. 395 (2021)
The Court unanimously disagreed. The two verbs shared a single direct object and formed an integrated clause, so splitting the modifier between them read as unnatural. The qualifier applied to both “store” and “produce.” The practical effect was substantial: a narrower definition of autodialer eliminated a wave of TCPA class actions seeking statutory damages of up to $1,500 per call.3Supreme Court of the United States. Facebook, Inc. v. Duguid, 592 U.S. 395 (2021)
The test courts apply is whether the list items form a cohesive class. “Interior walls, ceilings, or floors that require repainting” reads naturally as a group; limiting the painting requirement to floors would be strange. But a list mixing unrelated categories pulls the reading back toward the last antecedent rule.
How Punctuation Changes the Result
A single comma can override the last antecedent rule entirely. When a qualifying phrase is set off from the preceding list by a comma, courts treat the punctuation as a signal that the modifier reaches back across every item in the list. One legal treatise puts it bluntly: the comma “throws the modification back to all the previous items.”4Judicature. The Doctrine of the Last Antecedent, the Example in Barnhart, and Why Both Are Weak The Facebook v. Duguid Court itself pointed to the comma before “using a random or sequential number generator” as evidence that the qualifier applied to all preceding terms.3Supreme Court of the United States. Facebook, Inc. v. Duguid, 592 U.S. 395 (2021)
The Missing Comma That Cost $5 Million
In O’Connor v. Oakhurst Dairy, Maine’s overtime exemption statute listed exempt activities including “the canning, processing, preserving, freezing, drying, marketing, storing, packing for shipment or distribution of” certain foods. The question was whether “distribution” was its own exempt activity or part of the compound phrase “packing for shipment or distribution.”
The First Circuit held the statute ambiguous because there was no comma after “shipment.” Had the legislature written “packing for shipment, or distribution,” distribution would clearly have been a separate exempt activity. Without that comma, the drivers plausibly argued only “packing for” shipment or distribution was exempt. Maine law requires ambiguities in wage statutes to be resolved for workers, so the court sided with the drivers.5Justia Law. O’Connor v. Oakhurst Dairy, No. 16-1901 (1st Cir. 2017) Oakhurst Dairy settled for $5 million on behalf of 127 drivers. Maine rewrote the statute to use semicolons.
The Rule of Lenity as a Tiebreaker
In criminal cases, the stakes of choosing between the last antecedent rule and the series qualifier can be years of prison time. When the two canons point in opposite directions and neither clearly wins, defendants can invoke the rule of lenity, which requires ambiguous criminal statutes to be read in the defendant’s favor.
The Lockhart dissent argued the canons fought to a draw and lenity should have tipped the balance toward the narrower reading. The majority disagreed, finding the last antecedent rule decisive enough to resolve the question on its own.2Justia U.S. Supreme Court Center. Lockhart v. United States, 577 U.S. 347 (2016) Lenity remains available as a backup, but only once a court concludes the other interpretive tools have genuinely failed.
Why It Matters Outside the Courtroom
Most people run into the rule’s effects without noticing. Insurance policies, employment contracts, non-competes, and commercial leases all contain lists followed by modifiers, and how those modifiers attach can decide who owes what. The non-compete example at the top of this article is a live risk in real agreements: a restriction meant to cover sales, marketing, and consulting may, on a strict reading, only limit consulting.
The fix is defensive drafting. Repeat the modifier after each item. Use a tabulated list. Put the modifier at the front of the sentence. Replace commas with semicolons when a list runs long, as Maine did after Oakhurst. These moves cost nothing and head off disputes that can run into the millions.
The rule is a starting point, not a trump card. Courts set it aside when applying it would conflict with a statute’s overall purpose, when punctuation points the other way, or when the list items are tightly parallel enough to call in the series qualifier. Winning a last-antecedent argument takes more than pointing at the nearest noun. Context, structure, and the logical relationship among the listed items all decide whether the rule holds or bends.