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ShotSpotter is a gunfire detection system used by the Birmingham Police Department to provide rapid location data for gunfire in the city.

The system, which covers an area of over 6 square miles, uses a network of about 100 sensors connected to processing software which distinguish gunfire from other noises and triangulate the location to within about 40 feet so that officers can respond quickly. The inconspicuously-placed 360° microphones are spaced at about 12 to 20 sensors per square mile. Each sensor has a thermometer so that the speed of sound can be calculated precisely. The system also records data on each incident which can be used in statistical analysis and as evidence in prosecutions.

The equipment and software is supplied by ShotSpotter, Inc. of Mountain View, California and installed and supported by the South Carolina Research Authority. The cost for installation was $987,000 and the city pays about $100,000 per year to maintain the system.

The technology was one of the recommendations made by former Police Chief Annetta Nunn in 2006. It was touted by Mayor Bernard Kincaid in the 2007 State of the City address. Funding for the system was helped by a $1 million grant from the United States Department of Justice, spearheaded by Senator Richard Shelby.

The system was installed in late 2007 and was undergoing testing in December. The first arrest credited to the system was made in the East Precinct on January 30, 2008. James Rogers was arrested in the 200 block of 80th Street South for firing a rifle inside the city limits. He had outstanding warrants for criminal mischief, disorderly conduct and criminal trespassing.

On August 10, 2008 officers responded to multiple gunshots detected by the system in East Birmingham. There they found a man shot to death. According to homicide detective Roy Bristow it was the first time ShotSpotter detected gunfire involved in a homicide. As of February 2009 the system was credited with leading police to four arrests and two homicide victims. Deputy Chief Ray Tubbs told the Birmingham News that he hopes to expand the system and find better ways to make use of it in the department's crime-fighting efforts.

In 2010 city officials requested additional federal grants to expand the system. Over the next three years the number of detectors was increased from 90 to 120 and the covered area increased from 6 to 7 square miles.

Gunfire incidents detected

July 2008: 1,040
August 2008: 650
September 2008: 816
October 2008: 999
November 2008: 1,077
December 2008 (including New Year's Eve): 1,705
January 2009 (including New Year's Day): 1,415
July 2-5, 2010: 495 gunshots & 9,271 firework reports
July 3-5, 2011: 75 gunshots & 170 firework reports
New Year's 2012: 466
New Year's 2013: 403
New Year's 2014: 343
New Year's 2018: 469
New Year's 2019: 960 (program range increased 30%)
New Year's 2020: 965


  • "ShotSpotter Announces Contract with South Carolina Research Authority for Birmingham's Gunshot Location System." (May 1, 2007) press release. ShotSpotter, Inc.
  • Norris, Toraine (December 18, 2007) "Birmingham Mayor Larry Langford plans to set up hidden cameras in high-crime areas." The Birmingham News
  • Norris, Toraine (January 31, 2008) "Birmingham's gunshot detector system credited with man's arrest." The Birmingham News
  • Gray, Jeremy (August 10, 2008) "ShotSpotter leads Birmingham police to slain man." The Birmingham News
  • Norris, Toraine (February 26, 2009) "ShotSpotter helps police put gunfire in the crosshairs." The Birmingham News
  • Gray, Jeremy (July 6, 2011) "ShotSpotter records 75 gunshots, 170 fireworks in Birmingham during Fourth of July weekend." The Birmingham News
  • Paepcke, Jon (January 23, 2014) "13 Investigates: Shotspotter Progress." Alabama's 13
  • Prickett, Sam (January 6, 2019) "Police Fight Alabama’s Gun Culture, Stress Gun Safety Education in Effort to Reduce Violent Crime." BirminghamWatch

External links

See also