chicagoeads

HRDAG estimates that 1 in 3 Americans murdered by a stranger are killed by a police officer. https://granta.com/violence-in-blue/

In Chicago, the police union has attempted to destroy complaint records and uses an arbitration clause to minimize impact of discipline and to keep information about sustained misconduct complaints under wraps, including other police departments considering hiring an officer (https://projects.propublica.org/graphics/il-grievances).

(Full disclosure, I'm a co-author of the OP linked article and the article about CPD grievances.)

Only a few major police departments have done it themselves, Dallas PD being the most notable as one of the first and most comprehensive I've come across.

(Full disclosure, I'm a co-author of the article linked here.)