Many cities use 311 as a non-emergency phone line.
A new study has shown the calls to the number can accurately predict future opioid overdose hotspots.
According to UPI, the accuracy of the prediction is more than 90%.
The study shows that neighborhoods with high rates of opioid-related overdoses make more calls to non-emergency hotlines.
Most of the non-emergency reports involve code violations, abandoned vehicles, and other public nuisances.
311 reports of pests, unsanitary conditions, and streetlight outages predict future overdose hotspots more than 80% of the time.