October Term 2010 · Docket 09-571

When does one mistake prove a prosecutor office failed to train staff?

A district attorney's office faces liability for one wrongful conviction. The office argues one error does not prove systemic training failure.

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Connick v. Thompson
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Verified source milestones

  1. — An official oral-argument transcript was verified.
  2. — An official oral-argument transcript was verified.

The arguments, in order

This case may have been argued more than once. Each entry below uses that session's official transcript. Later arguments do not erase earlier ones.

  1. Argument 1 ·

    What happened at the argument

    Mr. Duncan argued the lower court should dismiss the claim. He stated one error does not show a pattern of violations.

    Justice Sotomayor questioned if one incident proves a lack of training. She noted that rookie prosecutors often lack experience in specific legal areas.

    Justice Ginsburg suggested the case does not fit a single rookie error. She implied the situation involves broader systemic issues.

    Read the official transcript for this argument · Official argument details

    Sources used for this argument breakdown

A citizen's guide to the whole case

What this case is about

This case tests when a single legal error proves a prosecutor's office failed to train its staff. The office argues one mistake does not show a pattern of neglect. The victim argues one error proves the office ignored known risks.

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How the case got here

The Supreme Court heard oral argument in this case on October 6, 2010.

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What each side wants

The office wants the court to dismiss the training claim. It argues one error does not prove a pattern of neglect.

The victim wants the court to keep the liability finding. It argues one error proves the office ignored known risks.

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What each side says

The office argues one incident does not show a pattern of violations. It claims the law requires repeated errors for liability.

The victim argues one incident is enough if the risk is obvious. It claims the office knew training was necessary.

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What the justices asked

Justice Sotomayor asked if rookie prosecutors need specific training on legal duties. She questioned if one incident proves a lack of training.

Justice Ginsburg asked if the situation fits a single rookie error. She questioned if the case fits a narrow legal category.

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Why it matters

This case defines when a single legal error proves systemic neglect. It sets the standard for holding government offices accountable for staff training failures.

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What happens next

This article currently covers the argument record. Use the official docket link for later case activity.

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Official Court provenance

Official docket and case history · Official Supreme Court oral-argument detail page

Title and summary sources

Revision history

  1. Revision 1 · Official Transcript ·

    Correction: Rewritten to the concise citizen-facing editorial standard.

  2. Revision 2 · Official Transcript ·

    Correction: Migrated to the dated official Court activity contract without model use.

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