In addition to [ShotSpotter’s] history of false positives, the danger it poses to pedestrians and residents, and the company’s dubious record of altering data at the behest of police departments, there is also a civil liberties concern posed by the fact that these microphones intended to detect gunshots can also record human voices.
Yet people in public places—for example, having a quiet conversation on a deserted street—are often entitled to a reasonable expectation of privacy, without overhead microphones unexpectedly recording their conversations.
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