October Term 2004 · Docket 03-923

Does a drug dog sniff during a traffic stop require probable cause?

Illinois argues a dog sniff is not a search. Cabales argues the sniff invaded his privacy rights.

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Illinois v. Caballes
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Official Transcript

Verified source milestones

  1. — 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

    Lisa Madigan argued the sniff is not a search. She cited Place and Edmond as precedent for this view.

    Robert Wray stated the stop was lawful. He noted the stop lasted less than nine minutes.

    Michael Meczyk argued the state lacked justification. He claimed the sniff invaded Cabales' Fourth Amendment interests.

    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

The case tests whether a drug dog sniff during a lawful traffic stop counts as a Fourth Amendment search. Illinois claims the sniff needs no justification. Cabales claims the sniff violated his privacy rights.

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How the case got here

The Supreme Court heard oral argument in this case on November 10, 2004.

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What each side wants

Illinois wants the Court to rule the dog sniff is not a search. This would let police use dogs freely during traffic stops.

Cabales wants the Court to rule the dog sniff is a search. This would require police to have a valid reason before using a dog.

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What each side says

Illinois argues a dog sniff is not a search. They cite prior cases saying sniffs need no Fourth Amendment justification.

Cabales argues the sniff invaded his privacy. He says the state offered no valid Fourth Amendment justification for the action.

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What the justices asked

Justice Stevens asked if officers knew Cabales in advance. He noted they do not arrest every speeding driver.

Justice Kennedy asked if the location mattered more than the target. He questioned the nature of the place searched.

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Why it matters

This case defines police power during traffic stops. It determines if dogs can sniff cars without suspicion. The outcome shapes privacy rights on public roads.

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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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