If elected, Mr. Thompson said he would increase the city police force by 2, 000 officers, flood high-crime areas with veterans instead of rookies and fix "stop and frisk, " a tactic in which officers can stop people whom they reasonably suspect of criminal behavior.

WSJ: Thompson Turns to Bratton

Mobile fingerprint scanners have helped a police force to identify more than 2, 200 people on the spot since August.

BBC: Birmingham & Black Country

In Britain ethnic minorities make up 6% of the population but only 2% of the police force and a little over 1% of the armed forces.

ECONOMIST: Race