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When "Harmless Error" Causes Harm

How "harmless error" lets courts affirm convictions without ever knowing what a jury would have done.

By Evelyn Hernandez · First published on Justice and the Record, September 3, 2026

"Harmless error" may be the most consequential two words in criminal appeals. A trial happens, something goes wrong, the defendant appeals, and the court says: yes, that was an error, but it didn't matter. Affirmed.

This article explains that the doctrine rests on something no court can actually do: know what twelve jurors would have decided if the error had not happened. Appellate judges reconstruct that answer from a cold transcript, years later, and announce it with confidence.

It distinguishes the two tests courts use. The "strength of the evidence" test asks whether there was enough evidence to convict anyway, which favors the government and slides from "was this trial fair?" into "is she guilty?" The "effect on the verdict" test asks whether this specific error could have changed what this jury decided. Constitutional errors are supposed to get the strictest standard, with the government proving harmlessness beyond a reasonable doubt, but courts often drift back to weighing the evidence.

Key points

How this applies to Elizabeth Hernandez's case

In Elizabeth Hernandez's appeal, the Eleventh Circuit found one error and accepted the government's concession of a second, then held both harmless, relying in part on what it called overwhelming evidence. The opinion does not mention that the same jury acquitted her on two counts. Read how that played out.

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