Last month, San Francisco became the first city to ban facial recognition. Now, other cities in California like Oakland and Berkley are considering bans on the technology, as well. 

The 5-4 majority agreed that taking a DNA cheek swab is akin to fingerprinting or photographing, but the dissenting justices saw it as a major change in police powers.

Camden, N.J., which ranks consistently among the top 10 most dangerous U.S. cities, is disbanding its 141-year-old police force in favor of a non-union county force.

The Detroit Police Department strives to direct emergency services more efficiently with  prioritized 911 calls and their "virtual precinct" plan.