Mon Jan 1, 0001

“We Kill People Based on Metadata” and Related Concepts

Michael Hayden Quote

Former NSA Director (1999-2005) and CIA Director (2006-2009) General Michael Hayden stated “We kill people based on metadata” at a debate at Johns Hopkins University School of Advanced International Studies (SAIS), April 7, 2014. Debate partner: journalist David Cole.

Context: metadata (call records, geolocation, network analysis) is operationally powerful enough to serve as basis for lethal targeting decisions (drone strikes). This undercuts the government’s simultaneous argument that bulk metadata collection is minimally invasive to privacy.

Keith Alexander “Collect It All”

Former NSA Director (2005-2014). Phrase reported by Glenn Greenwald via Snowden documents (2013). Described Alexander’s approach of vacuuming up all available signals intelligence rather than targeting specific suspects. Washington Post and Greenwald attributed phrase to Alexander’s directives during visits to overseas collection sites.

Mosaic Theory of Surveillance

United States v. Maynard, 615 F.3d 544 (D.C. Cir. 2010)

D.C. Circuit held prolonged GPS tracking of Antoine Jones’s vehicle for 28 days constituted a Fourth Amendment search, even though any single trip on public roads would not be protected. Court: “the whole of a person’s movements over the course of a month” reveals far more than individual trips — aggregation creates a mosaic of the person’s life that is constitutionally protected.

United States v. Jones, 565 U.S. 400 (2012)

On appeal. SCOTUS unanimously held GPS device was a search (Scalia majority: trespass/property theory).

Sotomayor concurrence: Explicitly endorsed mosaic concept. GPS monitoring “generates a precise, comprehensive record of a person’s public movements that reflects a wealth of detail about her familial, political, professional, religious, and sexual associations.”

Alito concurrence (joined by 3 justices): Longer-term surveillance crosses a Fourth Amendment threshold based on societal expectations of privacy.

Carpenter v. United States, 585 U.S. 296 (2018)

Applied similar reasoning: 127 days of historical CSLI was “detailed, encyclopedic, and effortlessly compiled” — aggregated location data requires a warrant.

Compelled Decryption / Biometric Unlock

Riley v. California, 573 U.S. 373 (2014)

SCOTUS unanimous: warrant required to search cell phone incident to arrest. Phones' vast storage qualitatively different from physical items.

Fifth Amendment Split

Passcodes: generally treated as testimonial (protected — reveals contents of mind). Biometric unlocks (fingerprint, face): some courts treat as non-testimonial (physical characteristic).

Key Rulings

  • In re Search of a Residence in Oakland, California (N.D. Cal. 2019, Magistrate Judge Westmore): Denied warrant for compelled biometric unlock. Compelling biometrics is functionally testimonial — communicates ownership/control of device.
  • State v. Diamond (Minn. 2017): Compelled fingerprint unlock NOT testimonial.
  • Seo v. State (Ind. 2018): Compelled phone unlock (including biometric) protected by state constitution’s self-incrimination clause.

Question remains unsettled at Supreme Court level.

Sources

  • Johns Hopkins SAIS debate (April 7, 2014)
  • Glenn Greenwald / Snowden documents (2013)
  • United States v. Maynard, 615 F.3d 544 (D.C. Cir. 2010)
  • United States v. Jones, 565 U.S. 400 (2012)
  • Carpenter v. United States, 585 U.S. 296 (2018)
  • Riley v. California, 573 U.S. 373 (2014)