San Diego has installed thousands of microphones and cameras in so-called smart streetlamps in recent years as part of a program to assess traffic and parking patterns throughout the city. However, the technology over the last year caught the attention of law enforcement. Today, such video has been viewed in connection with more than 140 police investigations. Officers have increasingly turned to the footage to help crack cases, as frequently as 20 times a month. Police department officials have said that the video footage has been crucial in roughly 40 percent of these cases. Privacy groups have voiced concerns about a lack of oversight, as law enforcement has embraced the new technology. Groups, such as the American Civil Liberties Union, have pushed city councils across the country to adopt surveillance oversight ordinances that create strict rules around using everything from license plate readers to gunshot-detection systems to streetlamp cameras. San Diego's smart streetlamp program started around 2016. Three years later, it's still unclear what the data will ultimately be used for. Right now, only the police department has the authority to view the actual video footage. This arrangement has disturbed Matt Cagle, technology and civil liberties attorney with the ACLU. "This sounds like the quote, 'just trust us' approach to surveillance technology, which is a recipe for invasive uses and abuse of these systems," he said.