One week ago, people celebrated in the streets of Minneapolis as a judge read the guilty verdicts in the trial of former police officer Derek Chauvin, convicted of murdering George Floyd.

In the days since, the Justice Department announced it would investigate whether the police departments in Minneapolis and Louisville, where Breonna Taylor was killed by police, engage in a "pattern or practice" of discrimination or excessive force.

But even as advocates and family members of those killed by police welcomed those developments, they said the need for structural change to policing has not disappeared — a point underscored, they said, by the police killings of Black people during and since the Chauvin trial in Brooklyn Center, Minn., Columbus, Ohio, and Elizabeth City, N.C.

"I don't want there to be any more George Floyds. It seems like this is a never-ending cycle," said Philonise Floyd, who since his brother's death has spoken before Congress and the United Nations Human Rights Council about police reform.

A flurry of legislative and policy proposals at every level of government in the U.S. followed last summer's protests. Cities such as Minneapolis, Seattle and Austin committed to rethinking police funding. Lawmakers in all 50 states put forward more than 2,000 bills related to policing in the last year.

But successes have been patchwork, mostly concentrated in blue states and cities facing outcry over local incidents of deadly force by police officers. Many other statehouses have seen little concerted effort to reform policing. And in Congress, partisan disagreements have so far prevented any bill from passing.

Reform in the U.S. has frequently come in bite-size portions as each high-profile death prompts scrutiny of a specific slice of policing.

Bans on neck restraints or chokeholds, called for by activists after Eric Garner was killed by police in Staten Island in 2014, gained renewed attention this summer after Chauvin knelt on Floyd's neck, another type of neck restraint.

And after Breonna Taylor was killed in her apartment late at night by Louisville police who had obtained a no-knock warrant, several states and cities moved to ban such warrants, including Louisville.

In Cleveland, where a police officer shot 12-year-old Tamir Rice within two seconds of arriving at a park where Rice was playing with a realistic toy gun in 2014, officials are reportedly preparing to roll out new policies around how police should interact with anyone under 18 years old.

Last year's nationwide protests turned up the pressure on lawmakers nationwide, and since then, about a dozen states have succeeded at passing more comprehensive legislation, according to a review of policing-related bills tracked by the National Conference of State Legislatures.

In states such as New York, Maryland and Washington, where statehouses are controlled by Democrats, lawmakers have moved to redefine use of force policies, impose body-worn camera rules, require officers to intervene when they see another officer using excessive force, and increase independent oversight over police agencies.

A bill in Colorado signed into law last June made that state the "ground zero" for police reform, Howard Henderson, founding director of the Center for Justice Research at Texas Southern University, told the Mountain West News Bureau.

That bill, known in Colorado as Senate Bill 217, imposed wide-ranging new rules on law enforcement agencies and prosecutors handling police use of force cases. It also permanently revokes professional certification for officers who have been found in court to have used inappropriate force, preventing them from being re-hired elsewhere.

Perhaps most notably, the bill stripped Colorado officers of the protection known as "qualified immunity," a series of legal precedents that has long kept police officers from being held personally liable from many claims of wrongdoing while on-duty.