Is NYC’s new gunshot detection system recording private conversations?

Is NYC’s new gunshot detection system recording private conversations? | Fusion
As Tyrone Lyles lay dying from a gunshot wound on an East Oakland street in 2007, he let out a few last words that would ultimately help authorities convict his killer.
“Why you done me like that, Ar?” he pleaded. “Ar, why you do me like that, dude?”
The exchange, which was used in court, was recorded by ShotSpotter, a gunshot detection system that has been installed in over 90 cities across the country. 
By placing a series of microphones around high-crime neighborhoods, the system is able to pinpoint the location of where a gunshot took place with surprising accuracy, leading to faster response times from police.
This week, 300 of the microphones were activated in Brooklyn and the Bronx as part of a citywide pilot program.
“Today, we are rolling out cutting edge technology to make the city safer, to make our neighborhoods safer, to keep our officers safer,” NYC Mayor Bill de Blasio said in an appearance with police commissioner William J. Bratton to announce the initiative. “This gunshot detection system is going to do a world of good in terms of going after the bad guys.”
But cases in which microphones have picked up incriminating evidence have raised the eyebrows of privacy advocates, who note that there could be Fourth Amendment implications.
“We are always concerned about secondary uses of technology that is sold to us for some unobjectionable purpose and is then used for other purposes,” Jay Stanley, a senior policy analyst at the American Civil Liberties Union’s Speech, Privacy and Technology Project, told Take Part. “If [ShotSpotter] is recording voices out in public, it needs to be shut down.”