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    Modern technology was instrumental in rescue of Olivia Ambrose

    Boston Police released this photo of person of interest in relation to missing person Olivia Ambrose. Person now identified as Victor Pena and Olivia has been found in his apartment in Bunker Hill Housing Development on 1/22/19. photo: BPD
    Boston Police Department
    An image from surveillance video released by Boston police showed Victor Pena.

    Someone’s always watching.

    That fact of modern urban life was highlighted by the case of Olivia Ambrose, the 23-year-old woman who was allegedly abducted after leaving a downtown bar Saturday night.

    Using video images, police say they were able to see Ambrose leave Faneuil Hall, walk up Congress Street with her alleged kidnapper’s arm around her, head into the State Street T Station, exit at Community College Station, and walk toward the suspect’s apartment in Charlestown.

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    It was that footage, along with a signal from Ambrose’s iPhone, that police say helped them find the young woman alive in the man’s home Tuesday afternoon.

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    “I think it quite possibly saved this girl’s life,” said Edward F. Davis, a former Boston police commissioner. “The combination of the cameras and the cellphone technology brought this to a positive and quick end.”

    But the success in finding Ambrose also underscored how such a vast and powerful surveillance network can threaten people’s privacy, particularly when there is no independent oversight.

    Kade Crockford, director of the Technology for Liberty Program at the ACLU of Massachusetts, said police won’t disclose how many cameras there are in Boston, “but we know there are a whole lot.”

    The MBTA said Wednesday that it owns “thousands” of cameras like the one that captured clear images of the alleged kidnapper, Victor Pena, guiding Ambrose up a set of subway stairs.

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    The Massachusetts Department of Transportation said it owns another 500 traffic cameras and 140 security cameras on buildings and infrastructure in Boston.

    The Boston Transportation Department owns 285 traffic cameras in the city and can tap into another 450 owned by the Boston police.

    Suspect arraigned in alleged kidnapping of Olivia Ambrose

    Many are part of a federally funded network, called the Critical Infrastructure Monitoring System, that was designed and built in 2006, based on a framework launched in 2004, when Boston hosted the Democratic National Convention, Crockford said.

    The system, she said, connects Boston police to police in eight surrounding communities, including Somerville, Cambridge, and Brookline.

    Officers at the Boston Regional Intelligence Center, she said, can use the system to access cameras across the region. It was that extensive network, she said, that helped investigators track Ambrose from Hennessy’s bar to Pena’s apartment in the Bunker Hill housing development.

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    “Certainly, it can be used for good, and it can also be used for bad, to violate people’s rights,” Crockford said. “Any system that is powerful demands strong checks and balances to ensure it is not misused, and, frankly, no such checks and balances exist in the city of Boston today.”

    She said the secrecy surrounding the program means the police don’t have to publicly report who uses the cameras, under what circumstances, how long the footage is stored, and whether there is any internal review of the video monitoring.

    Oakland, Calif., she said, has a privacy commission to oversee its police surveillance system.

    “The city of Boston needs something like that because, while a lot of people will look at what law enforcement did in this case, some people will look at it and think, ‘Wow. That’s a lot of power for the government to have — the ability to track us not just on one camera, but throughout a networked system.’ ”

    Davis said that when he led the department from 2006 to 2013, the large majority of cameras on city streets were operated by the Boston Transportation Department. Boston police have some of their own, he said, but typically use cameras from other city agencies, as well as private businesses, when investigating crimes.

    “I think it makes abundant sense because this is such a powerful weapon to utilize against crime,” he said. “There are people who believe, eventually, it will be impossible to commit a crime without being identified in an urban area in the very near future.”

    Davis was commissioner in 2013 when video footage released by the FBI helped authorities identify Tamerlan and Dzhokhar Tsarnaev after they planted bombs at the Boston Marathon.

    Researchers said while cameras can be helpful in cracking such cases, evidence is mixed about whether they help deter crime.

    A 2010 report by M. Angela Sasse, a security researcher, concluded that closed-circuit television cameras in the United Kingdom, where they are ubiquitous, were “largely ineffective” in preventing crime. A 2011 Urban Institute study of Baltimore, Chicago, and Washington, D.C., found crime fell in some areas with surveillance cameras while remaining unchanged in others.

    “The idea of wiring up a city and placing cameras on every corner in the hope you’re going to proactively respond to crime, you’re not going to see that be effective on a wide scale,” said Jennifer King, director of privacy at the Stanford Center for Internet and Society.

    The Ambrose investigation, King said, “is the best case of what we want to see public surveillance do. It was there as a retrospective investigative tool.”

    Susan Landau, a professor of cybersecurity and policy at the Fletcher School at Tufts University, agreed the Ambrose case showed the power of cameras to help solve crimes.

    “The flip side is the sense that you’re always being watched, and the fact that the cameras are being used to home in on vulnerable populations such as minorities and young women,” she said.

    Hoping to protect its residents from such intrusion, Cambridge adopted an ordinance in December that requires City Council approval of new surveillance technology such as license plate readers or social media monitoring software.

    The law also requires Cambridge police and other city agencies to report on how they use the technology while protecting privacy. Lawrence adopted a similar measure last September.

    Brenda Bond, a Suffolk University professor who studies public safety policies, said cameras are a “double-edged sword” that raise complicated questions about transparency, privacy, and costs.

    “I don’t think a lot of those questions can be answered in this case,” she said. “But in this case, you can see the unbelievable benefits of having that data available.”

    Matt Rocheleau of the Globe staff contributed to this report. Michael Levenson can be reached at michael.levenson@
    globe.com
    .