Keen On America

Your Data Will Be Used Against You: Andrew Guthrie Ferguson on Policing in the Age of Self-Surveillance

Feb 5, 2026
Andrew Guthrie Ferguson, law professor and surveillance expert, discusses how our devices become courtroom evidence. He covers pacemaker data used to convict, AI-powered real-time crime centres, surveillance at protests, gaps in Fourth Amendment protections, and his “tyrant test” idea for designing stronger data limits.
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ANECDOTE

Convicted By His Own Heartbeat

  • Detectives used a patient's pacemaker heartbeat data to contradict his story and secure a conviction for arson and insurance fraud.
  • Andrew Guthrie Ferguson highlights this case to show how involuntary medical data can be turned into prosecutorial evidence.
INSIGHT

Companies Define Access Rules By Default

  • Tech companies currently set many access rules because there is little controlling law about government use of personal data.
  • Ferguson notes Google designed a three-part warrant process rather than courts or legislatures defining the standard.
ADVICE

Create Privileged Digital Categories

  • Create legal privileges for particularly intimate digital data similar to attorney-client or marital privileges.
  • Ferguson argues some digital categories should be off-limits to prosecutors even with warrants.
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