The American Civil Liberties Union of Massachusetts wants Suffolk County District Attorney Rachael Rollins to make good on her promise to not prosecute certain low-level crimes.

Rollins made national headlines during the campaign for her pledge to not prosecute some 15 misdemeanors and low-level felonies, ranging from trespassing to receiving stolen property.

After she was sworn in, Rollins said she was taking a “hard look” at the list before implementing the proposal, according to the Boston Herald.

Now a report analyzing county prosecution data from 2013 and 2014 suggests that more than half of those low-level crimes identified by Rollins were dismissed at the time by then-District Attorney Dan Conley. The report suggests police disproportionately filed charges against people of color, particularly black residents.

“Our analysis begs the question: Why are people being charged for crimes that are not being prosecuted?” said Carol Rose, executive director of the ACLU of Massachusetts. “Diversion is an important tool at the disposal of law enforcement officials, but many of these cases should have never been brought in the first place.”

The ACLU of Massachusetts called for Rollins to not only implement her campaign pledge but also make structural changes to her agency to make sure her prosecutors follow the policy. The organization also called for structural changes to police departments to curb arrests for low-level offenses.

Rene Algarin, a Rollins spokeswoman, said in a statement that the data reveals the list targets crimes that were already bring dismissed without causing an increase in crime.

”In fact, crime has been declining over several years,” Algarin wrote. “Scaling back the prosecution of low-level, non-violent offenses even further and relying instead on treatment and diversion can achieve even better results.”

Nearly 60 percent of all crimes that Rollins put on her proposed “Decline to Prosecute” list were dismissed in 2013 and 2014, according to the report. The ACLU suggests that this pattern means over half of the charges weren’t worthwhile prosecution and served only to target minorities.

According to the report, black people were charged with offenses such as trespass, resisting arrest and disorderly conduct three times as often as white people. Black people were charged for driving offenses four times as much as white people.

“If there were a significant public safety concern, an overwhelming majority of these cases would likely be prosecuted to an adverse disposition,” the report states. “It also affirms the proposed practice Rollins intends to implement.”

The ACLU of Massachusetts recommended changes for agencies beyond the Suffolk County District Attorney’s office. The report calls for research across the Commonwealth examining how assistant prosecutors pursue cases on a weekly basis, including the cost, benefit and efficacy of prosecuting the 15 low-level crimes. It also calls for community-led alternatives to prosecution that would involve cooperation between the Suffolk County District Attorney’s office and local stakeholders such as community organizers, small business owners and healthcare advocates.

The ACLU called for police departments not only to enact “Decline to Arrest” policies similar to Rollins’ campaign pledge, but to also examine their arrest records for potential racial disparities regarding the 15 types of offenses.

The list stirred controversy during her campaign. A group called the National Police Association filed a complaint against Rollins to the Office of the Bar Counsel claiming the Massachusetts lawyer violated several rules of professional conduct, including “promising to implement policy positions that are illegitimate, contrary to law, contrary to her ethical obligations as an attorney and further a clear and immediate danger to the public’s overall health and well-being.”

That controversy seems to have died down since Rollins took office. Boston Police Commissioner William Gross said earlier this year that he was not concerned with the list, but implementing such a policy at local police departments could prove difficult.

Chelsea Police Chief Brian Kyes told the Herald he was optimistic about working with Rollins but was concerned about any policies related to drug dealing. Her campaign website lists drug possession and drug possession with intent to distribute as two of the crimes she would decline to prosecute under the policy.

Meanwhile, CourtWatch MA is advocating for Rollins to implement the program and address racial disparities involving those 15 offenses. The community project analyzes municipal court cases each week to understand how those offenses are handled. The most recent report states that 38 cases, or 42.2 percent, moved forward as criminal matters between Feb. 6 and Feb. 12. Another 38 cases were dismissed at arraignment and 14 were diverted to community service, drug treatment or some other outcome.

Daniel Medwed, a Northeastern University law professor, told WGBH on Tuesday that while groups should hold local prosecutors accountable, Rollins is just getting started.

“She’s an evolutionary, not a revolutionary,” he said. “She knows the best way to win over the hearts and minds of the law enforcement establishment is not through dramatic change, but through incremental reforms that can get buy-in from people.”