SURVEILLANCEHow 9/11 Changed the Way America Surveils Its Citizens

By Amanda Watford

Twenty-five years after 9/11, the surveillance infrastructure built and expanded in its aftermath has become part of a far larger digital ecosystem — producing tools that can collect and analyze information on a scale unimaginable in 2001.

The terrorist attacks of Sept. 11, 2001, did more than reshape the nation’s approach to terrorism. They changed the architecture of American intelligence and policing. They expanded how government agencies collect, share and analyze information, and brought national security tools deeper into ordinary law enforcement.

The infrastructure built in the attacks’ aftermath has proved remarkably durable. Joint terrorism task forces and fusion centers brought federal, state and local agencies into closer intelligence-sharing networks. New laws expanded the government’s ability to obtain information. And police departments acquired technologies that once belonged largely to the realm of national security.

But the expansion of surveillance did not go uncontested. Civil liberties groups warned that the new powers could erode Americans’ privacy and constitutional protections, while many Americans accepted expanded government surveillance as a necessary tradeoff for safety in the aftermath of the attacks. 

The country also entered a period of heightened scrutiny for people perceived as foreign or potentially threatening — with American Muslims and immigrant communities bearing a particularly heavy burden.

Then came the digital revolution.

Americans began carrying smartphones, broadcasting their lives on social media and generating enormous amounts of commercially collected data. Police gained access to license plate readers, networks of cameras, cellphone location information and other technologies capable of tracking people and mapping their movements.

Now, artificial intelligence is adding another layer: systems that can sift through those vast stores of information, connect previously separate databases and generate analyses in seconds.

Some surveillance and privacy experts say that the amount of information available to the government — and its ability to make sense of it — has fundamentally changed since 9/11. 

That has taken on new urgency as surveillance systems have moved further into everyday life. Automated license plate readers can track where people drive. Facial recognition can help identify people in crowds. Commercial data can reveal where and how people live and travel. And increasingly, artificial intelligence can analyze and connect these streams of information at a speed no human investigator could match. 

Those capabilities have raised concerns among some experts and advocates about how surveillance could be used to monitor protests, track immigrants and identify people seeking reproductive healthcare.