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August 22, 2021 02:34 pm

AI-Powered Tech Put a 65-Year-Old in Jail For Almost a Year Despite 'Insufficient Evidence'

"ShotSpotter" is an AI-powered tool that claims it can detect the sound of gunshots. To install it can cost up to $95,000 per square mile — every year — reports the Associated Press. There's just one problem. "The algorithm that analyzes sounds to distinguish gunshots from other noises has never been peer reviewed by outside academics or experts.""The concern about ShotSpotter being used as direct evidence is that there are simply no studies out there to establish the validity or the reliability of the technology. Nothing," said Tania Brief, a staff attorney at The Innocence Project, a nonprofit that seeks to reverse wrongful convictions. A 2011 study commissioned by the company found that dumpsters, trucks, motorcycles, helicopters, fireworks, construction, trash pickup and church bells have all triggered false positive alerts, mistaking these sounds for gunshots. ShotSpotter CEO Ralph Clark said the company is constantly improving its audio classifications, but the system still logs a small percentage of false positives. In the past, these false alerts — and lack of alerts — have prompted cities from Charlotte, North Carolina, to San Antonio, Texas, to end their ShotSpotter contracts, the AP found. And the potential for problems isn't just hypothetical. Just ask 65-year-old Michael Williams:Williams was jailed last August, accused of killing a young man from the neighborhood who asked him for a ride during a night of unrest over police brutality in May... "I kept trying to figure out, how can they get away with using the technology like that against me?" said Williams, speaking publicly for the first time about his ordeal. "That's not fair." Williams sat behind bars for nearly a year before a judge dismissed the case against him last month at the request of prosecutors, who said they had insufficient evidence. Williams' experience highlights the real-world impacts of society's growing reliance on algorithms to help make consequential decisions about many aspects of public life... ShotSpotter evidence has increasingly been admitted in court cases around the country, now totaling some 200. ShotSpotter's website says it's "a leader in precision policing technology solutions" that helps stop gun violence by using "sensors, algorithms and artificial intelligence" to classify 14 million sounds in its proprietary database as gunshots or something else. But an Associated Press investigation, based on a review of thousands of internal documents, emails, presentations and confidential contracts, along with interviews with dozens of public defenders in communities where ShotSpotter has been deployed, has identified a number of serious flaws in using ShotSpotter as evidentiary support for prosecutors. AP's investigation found the system can miss live gunfire right under its microphones, or misclassify the sounds of fireworks or cars backfiring as gunshots. Forensic reports prepared by ShotSpotter's employees have been used in court to improperly claim that a defendant shot at police, or provide questionable counts of the number of shots allegedly fired by defendants. Judges in a number of cases have thrown out the evidence... The company's methods for identifying gunshots aren't always guided solely by the technology. ShotSpotter employees can, and often do, change the source of sounds picked up by its sensors after listening to audio recordings, introducing the possibility of human bias into the gunshot detection algorithm. Employees can and do modify the location or number of shots fired at the request of police, according to court records. And in the past, city dispatchers or police themselves could also make some of these changes. Three more eye-popping details from the AP's 4,000-word exposé"One study published in April in the peer-reviewed Journal of Urban Health examined ShotSpotter in 68 large, metropolitan counties from 1999 to 2016, the largest review to date. It found that the technology didn't reduce gun violence or increase community safety..." "Forensic tools such as DNA and ballistics evidence used by prosecutors have had their methodologies examined in painstaking detail for decades, but ShotSpotter claims its software is proprietary, and won't release its algorithm..." "In 2018, it acquired a predictive policing company called HunchLab, which integrates its AI models with ShotSpotter's gunshot detection data to purportedly predict crime before it happens."

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