Following Derek Chauvin's conviction in the murder of George Floyd, the Justice Department launches a "pattern or practice" investigation into the Minneapolis Police Department.
Read MoreFormer congressman John Conyers, who died at 90 on October 27, left office under a cloud. But he also left an important legacy for criminal justice reform: the "pattern or practice" statute that gave the Justice Department authority to go after law enforcement agencies engaged in unconstitutional practices like racial profiling.
Read MoreA federal judge says Seattle's new contract with police puts the city out of compliance with a 2012 consent that was supposed to make officers more accountable for use of force. We'll be watching this one closely.
Read MoreWhat are pattern-or-practice consent decrees? Trisha wants to know more about how they're being applied in her home city of Baltimore and other cities.
Read MoreSometimes a local law enforcement agency is so dysfunctional that the federal government has to get involved. What does a top-to-bottom overhaul of an entire police department look like?
Sam Walker is Professor Emeritus of Criminal Justice at the University of Nebraska, and a leading expert on police accountability.
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