Ashcroft v. al-Kidd, 563 U.S. 731

Abdullah al-Kidd, a U.S. citizen, filed a Bivens action alleging Ashcroft authorized using the material-witness statute to detain terrorism suspects pretrial without adequate evidence.
Al-Kidd was arrested in March 2003 and detained 16 days, though prosecutors never called him as a witness at al-Hussayen’s trial.
The Ninth Circuit held that the Fourth Amendment bars pretextual arrests absent probable cause and rejected Ashcroft’s immunity defenses.
The Supreme Court granted certiorari to resolve qualified-immunity and Fourth Amendment questions raised by the case.
The Court of Appeals’ reasoning was deemed flawed at both prongs of the qualified-immunity analysis, and the Supreme Court reversed in part.
The majority held that, assuming a valid material-witness warrant, the arrest was objectively reasonable and Ashcroft was entitled to qualified immunity.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether Ashcroft has qualified immunity here	al-Kidd argues no clearly established law protected pretextual detention	Ashcroft argues immunity applies due to objective reasonableness	Ashcroft entitled to qualified immunity
Whether using a material-witness warrant for detention without probable cause violates the Fourth Amendment	Al-Kidd asserts pretext undermines reasonableness	Government maintains objective reasonableness with individualized suspicion and warrant	No Fourth Amendment violation found under the circumstances
Whether subjective motive is relevant to Fourth Amendment analysis in this context	Al-Kidd seeks motive-based invalidation of the arrest	Court should not probe motives absent exceptional circumstances	Motive is not considered in this context; decision focused on objective reasonableness
Scope of the material-witness statute and its applicability to pretrial detention	Statute can be misused to detain witnesses pretextually	Statute authorizes warrants when materiality and impracticability are shown	Question left narrow; Court assumed a valid warrant for purposes of analysis
Does the national-office role of the Attorney General affect clearly established law for qualified immunity	National officeholders should receive less deference due to nationwide impact	AGO’s position warrants deference given national scope	National-office deference recognized; no clearly established rule defeated immunity

Whren v. United States, 517 U.S. 806 (Supreme Court, 1996) (reiterates objective reasonableness standard; does not inquire into subjective motives)
Anderson v. Creighton, 483 U.S. 635 (Supreme Court, 1987) (clearly established law standard for qualified immunity)
Saucier v. Katz, 533 U.S. 194 (Supreme Court, 2001) (protocol for addressing qualified-immunity questions in sequence)
Edmond v. United States, 531 U.S. 32 (Supreme Court, 2001) (discusses objective vs. subjective purpose in special-needs contexts)
Knights v. United States, 534 U.S. 112 (Supreme Court, 2001) (acknowledges objective standard in certain to search/seizure contexts)
Devenpeck v. Alford, 543 U.S. 146 (Supreme Court, 2004) (distinguishes between probable cause and motive in certain investigations)
Wilson v. Layne, 526 U.S. 603 (Supreme Court, 1999) (concerns consensus of persuasive authority for clearly established law)
Malley v. Briggs, 475 U.S. 335 (Supreme Court, 1986) (standard for evaluating qualified immunity based on reasonable beliefs)
Pearson v. Callahan, 555 U.S. 223 (Supreme Court, 2009) (permits addressing either prong of qualified-immunity analysis first)
O’Connor v. Ortega, 480 U.S. 709 (Supreme Court, 1987) (individualized suspicion and workplace searches (cited for context))