While officers raced to a recent 911 call about a man threatening his ex-girlfriend, a police operator in headquarters consulted software that scored the suspect’s potential for violence the way a bank might run a credit report.
The program scoured billions of data points, including arrest reports, property records, commercial databases, deep Web searches and the man’s social- media postings. It calculated his threat level as the highest of three color-coded scores: a bright red warning.
Police officials say such tools can provide critical information that can help uncover terrorists or thwart mass shootings, ensure the safety of officers and the public, find suspects, and crack open cases. They say that last year’s attacks in Paris and San Bernardino, Calif., have only underscored the need for such measures.
But the powerful systems also have become flash points for civil libertarians and activists, who say they represent a troubling intrusion on privacy, have been deployed with little public oversight and have potential for abuse or error. Some say laws are needed to protect the public.