CHATTANOOGA, TN. (Times Free Press) -- "Incomplete and inaccurate" — that's the judgment about data on local gangs received from the Hamilton County Sheriff's Office and Chattanooga Police Department.

Researchers who spent six months compiling extensive information on gangs asked the two law enforcement agencies for data on every criminal incident for five years, with notation of which crimes are gang-related.

But researchers at the Ochs Center for Metropolitan Studies weren't satisfied completely with what the departments gave them.

Of the data the city provided, 16 percent had missing or incomplete demographic or gang information as well as inaccuracies such as incorrect or misspelled street names. The sheriff's office submitted data only after several requests, and even then it was unusable, according to the Comprehensive Gang Assessment report.

Read more on the story from our news partners at the Chattanooga Times Free Press.