https://techcrunch.com/2018/06/29/capital-gazette-maryland-face-recognition-mirs-law-enforcement/

When police had difficulty identifying the man whom they believed opened fire on a newsroom in Maryland, killing five people, they turned to one of the most controversial yet potent tools in the state’s law enforcement arsenal.

As The New York Times reports, Anne Arundel County Police Chief Timothy Altomare’s department failed to ID its suspect through fingerprinting. The department then sent a picture of the suspect to the Maryland Coordination and Analysis Center, which combed through one of the nation’s largest databases of mug shots and driver’s license photos in search of a match.