I worked for a DOJ contractor for 10 years (starting in 1991) and part of what I did was write and assemble reports on "emerging technology". I remember when this tech came out, and I've seen a LOT of the preliminary data from the inventors, LEAs and the Feds as to it's potential applications in the field, when I was working in support of NLECTC.
This tech has almost NOTHING to do with triangulating gunfire incidents. It CAN be used for that, but that is NOT what it was designed for, and that is NOT what it is being used for now, or in the future.
This tech was fielded primarily to skirt wiretapping and privacy laws, so that people having conversations in public (specifically, people talking on cell phones) can be recorded without warrants. Period. End of discussion.
People need to start designing solar-powered "pink noise generators" with powerful speakers to mount near these devices to bungle them up. Creative counter-surveillance is perfectly legal, ESPECIALLY in public places...