Controversial crime-fighting tool ShotSpotter was debated Tuesday night at Sacramento City Hall. Police say it helps increase response times, but others say it's a waste of money.

After more than an hour of discussion and debate, the Sacramento City Council voted 8 to 1 to approve spending more than $2 million on ShotSpotter over the next five years, but they also want the police department to provide an annual review of the technology.

When someone fires a gun in some Sacramento neighborhoods, police say about 80% of the time, nobody calls 911 to report the crime.

That's why, since 2015, Sacramento police have been using ShotSpotter, a network of outdoor acoustic sensors that can hear gunfire from up to three miles away and pinpoint its location.

The technology is now located in the n

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