October Term 2000 · Docket 99-8508

Does thermal imaging of a home violate the Fourth Amendment?

The dispute centers on whether warrantless thermal imaging of a residence constitutes an impermissible search.

Official caption
Kyllo v. United States
Latest argument session
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Argued
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Official Transcript

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

    Lerner stated the case involves thermal imaging of a home without a warrant.

    Lerner asserted this constitutes an impermissible search under the Fourth Amendment.

    Lerner described the home as the basic refuge for all citizens.

    Dreeben explained thermal imaging senses heat gradients on the exterior of a surface.

    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 examines the legal status of using heat-detection technology on a home's exterior.

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How the case got here

The Supreme Court heard oral argument in this case on February 20, 2001.

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What each side wants

Lerner seeks a ruling that the imaging is an illegal search.

Dreeben seeks a ruling that the imaging is not a search.

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What each side says

Lerner argues the home is a basic refuge protected by the Fourth Amendment.

Dreeben argues observing heat gradients on a surface is not a search.

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What the justices asked

Rehnquist noted the 200th anniversary of John Marshall's swearing in.

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Why it matters

The outcome defines the scope of privacy protections for residential spaces against modern surveillance tools.

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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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