'Keyword Warrants' Pose Privacy Threat

Police continue to utilize other digital tools to track suspects. One such tool, "keyword warrants," poses an even greater threat of privacy invasion. Like geofence warrants, the practice of seeking a keyword warrant is a technique of dragnet policing. A keyword warrant requires the production of all IP addresses for anyone who inputs a particular word or phrase into an internet search engine. The search results are then used to identify a device user. Asking Google or another internet service provider (ISP) to identify the person who typed a particular word or phrase requires no evidence of that individual's involvement in crime. Such requests instead invade innocent users' private information and inject it into criminal investigations, all without any basis other than a user entering a phrase in a search engine on their home computer.

More intrusive than geofence warrants, these keyword warrant applications cannot promise the court that the user was present at the crime scene, only that the user may have been thinking about something relevant to a crime or location under investigation. This raises questions like: Should the state police our thoughts? And, is it constitutional for a judge to authorize such a fishing expedition into the online activities of the public at large?