October Term 2012 · Docket 12-207

Does the Fourth Amendment allow police to collect DNA from arrestees without a warrant?

Maryland seeks to uphold its law requiring DNA collection from arrestees. King argues this practice violates his constitutional rights.

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Maryland v. King
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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

    Maryland argues arrestees are in a unique category. They are on the gateway into the criminal justice system. Their privacy expectations are substantially reduced.

    King argues the search was warrantless and suspicionless. He claims this practice is presumptively unconstitutional. He argues the state cites no valid exception.

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    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

Maryland wants to keep its law requiring DNA collection from arrestees. It claims this practice helps solve crimes. King wants the court to strike down the law. He argues it violates his Fourth Amendment rights.

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How the case got here

The Supreme Court heard oral argument in this case on February 26, 2013.

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What each side wants

Maryland wants to keep its DNA collection law for arrestees.

King wants the court to strike down the DNA collection law.

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What each side says

Maryland argues arrestees have reduced privacy expectations.

King argues warrantless suspicionless searches are unconstitutional.

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What the justices asked

Chief Justice Roberts asked how long the DNA procedure takes.

Justice Kagan asked if the state can search homes for unrelated crimes.

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Why it matters

This case defines the scope of police power during arrest. It determines whether DNA collection is a standard booking procedure. It affects the privacy rights of all arrestees nationwide.

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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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