Negative effects of policebody cameras

Body cameras are a valuable tool for law enforcement agencies. By promoting transparency, accountability, and public trust, they can help to improve policing practices and help provide a better service to their communities.

Further calling into question the appropriateness of ShotSpotter evidence for use in court is a third problem: the company's apparent tight relationship with law enforcement. A ShotSpotter expert admitted in a 2016 trial, for example, that the company reclassified sounds from a helicopter to a bullet at the request of a police department customer, saying such changes occur “all the time” because “we trust our law enforcement customers to be really upfront and honest with us.” ShotSpotter also uses reports from police officers as “ground truth” in training its AI algorithm not to make errors. A close relationship between ShotSpotter and police isn’t surprising — police departments are the company’s customers and the company needs to keep them happy. But that isn’t compatible with the use of its tool as “objective data” used to convict people of crimes.

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The IG’s report follows a similarly critical report and legal filing by the Northwestern School of Law’s MacArthur Justice Center and devastating investigative reporting by Vice News and the Associated Press. Last week, the AP profiled Michael Williams, a man who spent a year in jail on murder charges based on evidence from ShotSpotter before having his charges dismissed when prosecutors admitted they had insufficient evidence against him.

Clarke also pushed back on criticisms of Shotspotter’s efficacy and cost-benefit value. Those involve complex assessments of real-world data as well as value judgments that experts and communities will have to monitor, evaluate, and debate. As always, we don’t think any police technology should be deployed or used unless affected communities clearly want them.

But aural privacy is not the main problem with ShotSpotter, it turns out. There are several other very significant civil liberties problems with the technology.

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A critical report on the ShotSpotter gunshot detection system issued today by the City of Chicago’s Inspector General (IG) is the latest indication of deep problems with the gunshot detection company and its technology, including its methodology, effectiveness, impact on communities of color, and relationship with law enforcement. The report questioned the “operational value” of the technology and found that it increases the incidence of stop and frisk tactics by police officers in some neighborhoods.

Shotspotter installs 20 to 25 microphones per square mile in the cities where it is installed, and uses those microphones to try to identify and locate the sound of gunshots. In the past, we have scrutinized this company and its technology from a privacy perspective. Placing live microphones in public places raises significant privacy concerns. After looking at the details of ShotSpotter’s system, we didn’t think it posed an active threat to privacy, but we were concerned about the precedent it set (and others agreed).

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Shotspotter CEO Ralph Clarke reached out to us to vigorously dispute the sources of information that we relied upon for this post, and also pushed back on the company’s critics in a piece published last month in the Buffalo News. Most recently, his company filed a defamation lawsuit against Vice News; their complaint is a voluminous argument for the company’s technology. Two points in particular seem worth highlighting:

First, as the MacArthur Justice Center details, ShotSpotter is deployed overwhelmingly in communities of color, which already disproportionately bear the brunt of a heavy police presence. The police say they pick neighborhoods for deployment based on where the most shootings are, but there are several problems with that:

Body cameras enhance the safety of officers and civilians. Knowing their actions are being recorded can ensure officers follow procedures and can also deter civilians from behaving in a confrontational or aggressive manner.

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Given all of these problems, communities and the police departments serving them should reject this technology, at least until these problems are addressed, including through full transparency into its operation and efficacy.

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ShotSpotter portrays all of this as a straightforward and objective process, but it is anything but. Vice News and the AP note examples of the company’s analysts changing their judgments on all of the above types of results (which ShotSpotter disputes). In addition, the company uses AI algorithms to assist in the analysis — and as with all AI algorithms, that raises questions about reliability, transparency, and the reproducibility of results. The company turned down a request by the independent security technology research publication IPVM to carry out independent tests of its methodologies.

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The FOCUS X2 body camera is a reliable addition to the Safe Fleet law enforcement ecosystem. Designed with input from law enforcement agencies, it challenges each of these hurdles.

Second, one of the elements in the reporting on Shotspotter that alarmed me the most were references to the fact that the company was using AI as part of its system. The use of evidence in court derived from AI algorithms raises severe issues of transparency, accuracy, and fairness. Clarke said that they have algorithms that are used to “do the math” in triangulating the location of gunshots based on the timing of acoustic data from their sensors but, pressed on what that meant, he said they are not opaque deep-learning black boxes, but simply algorithms doing math that could otherwise be done by hand. Clarke said a more complex AI algorithm is used to filter out “pops, booms, and bangs” picked up by the company’s sensors that are believed to actually be gunshots before the audio is sent to human analysts for review. That’s not as much of a concern; inaccuracies in such an algorithm might result in some missed gunshots but aren’t going to lead to unfair evidentiary judgments.

The company’s sensors automatically send audio files to human analysts when those sensors detect gunshot-like sounds. Those analysts then decide whether the sounds are gunshots or other loud noises such as firecrackers, car backfires, or construction noises. They also triangulate the timing of when sounds reach different microphones to try to establish a location for the noise, and if it is believed to be the sound of gunshot, they make an effort to figure out how many shots were fired and what kind of gun is involved (such as a pistol versus a fully automatic weapon).

First, pressed on reports that the company has changed its evaluation of the details of gunshots in court, Clarke told me that the company provides two kinds of data about gunshots: an initial, real-time alert sent to police shortly after a gunshot is detected, and a much more thorough “detailed forensic report” that is prepared for court cases. Clarke said that what has been reported as Shotspotter “changing its story” reflects the differences between the real-time and detailed forensic reports.

Body cameras strengthen public trust in law enforcement agencies. By promoting good behavior, evidence transparency, and accountability, body cameras can help reinforce trust between law enforcement agencies and their communities.

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Body cameras can be used for police training. Footage from body cameras can identify areas where officers may need additional training and can help improve police practices.

Second, ShotSpotter’s methodology is used to provide evidence against defendants in criminal cases, but isn’t transparent and hasn’t been peer-reviewed or otherwise independently evaluated. That simply isn’t acceptable for data that is used in court.

History of policebody cameras

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Body camera recordings serve as valuable evidence in criminal cases. The captured footage provides an objective record of events that can be used to verify witness and officer testimony and ensure the accuracy of any report.

Receiving praise for their potential to improve transparency, accountability, and public trust and by deterring unwanted and illegal behaviors, these cameras also increase safety for both law enforcement personnel and the public.

Body cameras promote transparency by providing an objective record of police-civilian interactions. They help ensure that everyone is held accountable for their actions, provide an unbiased account of events, and help protect agencies from libel.

Finally, still up for debate is whether ShotSpotter’s technology is even effective. We can argue over a technology’s civil liberties implications until the end of time, but if it’s not effective there’s no reason to bother. A number of cities have stopped using the technology after deciding that ShotSpotter creates too many false positives (reporting gunshots where there were none) and false negatives (missing gunshots that did take place). The MacArthur Justice Center’s report found that in Chicago, initial police responses to 88.7 percent of ShotSpotter alerts found no incidents involving a gun. The company disputes whether this means its technology is inaccurate, pointing out that someone can shoot a gun but leave no evidence behind. But a review of the accuracy debate by IPVM concluded that “while public data does not enable a definitive estimation of false alerts,” the problem “is likely significantly greater than what ShotSpotter insinuates” because the company “uses misleading assumptions and a misleading accuracy calculation” in their advertised accuracy rates.

How do we know this? The National Institute of Justice has compiled reports from studies made in police departments all over the United States and the UK:

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An essential tool for law enforcement agencies worldwide, body cameras provide independent and reliable visual and audio evidence to verify events, document statements, and behaviors, and increase transparency with communities.