The story she tells is awash in irony. Jai had entered the police force to change it, and he died, Leisa believes, because of the very problems he wanted to fix. Growing up, Jai had not been immune to the racial profiling so often experienced by young Black males. But his father—from whom Leisa had long since been divorced—was a police officer, and through him Jai developed an interest in community-based police reforms. By joining the force, Jai hoped to change what he saw as a militaristic approach to policing, especially in low-income neighborhoods like the one where he eventually died.

Leisa tells me that one of the cops who shot her son had been his classmate at the police academy and might have recognized him if he had only paused an instant before shooting: “Out of uniform, in that neighborhood, Jai was just another target.”

When asked about the city’s handling of her son’s case, Leisa responds with exasperation—the type of chronic emotional fatigue known only to those unfortunate souls who have spent years fighting a more powerful and highly motivated enemy. You can’t fight city hall, they say. Most people know the phrase; Leisa Young has lived it.

From the very beginning, the city circled the wagons. Just two days after Jai’s death, the mayor of Providence declared in the local press that race had not been a factor in the shooting. In a televised interview, a high-ranking officer predicted the two shooters would be exonerated by the department’s internal investigation, which was just barely underway. Meanwhile, Leisa says, city officials worked privately to convince her that Jai was somehow at fault in his own death because he had been pointing his firearm sideways, “like a thug.” Recalling the accusation now, Leisa dismisses it with a laugh that is somehow charming and bitter at the same time: “Where would he have learned that? In thug school?”

The 2003 verdict has never been overturned, and in the eyes of the law, the violation of Jai Young’s civil rights is an unassailable fact. That verdict almost certainly would have ended the case if Leisa had been suing a trucking company over a traffic accident, or a chemical company over a cancer-causing pesticide. But hers was a civil rights lawsuit against a city government, and though she still does not understand what it means or why, she would spend the next two years trying to overcome something called the Monell Rule.

I first learned about the Monell Rule in 2013, shortly after I accepted my first civil rights case. I had been practicing business law in Texas for 15 years when a friend asked for my help in a case involving threats and extortion by a small-time city government. It was not my area of the law, so I immersed myself in legal research, and it wasn’t long before I encountered this little-known legal rule that, despite its obscurity, plays a massive role in virtually every federal civil rights lawsuit against a city or county government. One case led to another, and I have been fighting the Monell Rule ever since.

To understand it, one must go back briefly to the end of the Civil War, when Congress passed the Civil Rights Act of 1871. The 13th, 14th and 15th Amendments had just been ratified, promising civil rights to emancipated slaves and other citizens. The 1871 law—also known as the Third Enforcement Act—was designed to provide a mechanism for enforcing these constitutional guarantees and it authorizes individual citizens to bring private lawsuits for civil rights violations committed by police and other persons cloaked in the authority of state or local governments. Today, among lawyers, this law is known simply as “Section 1983,” and it remains one of the most important civil rights statutes in the country.

In 1961, in a case called Monroe v. Pape, the U.S. Supreme Court ruled that city governments were exempt under Section 1983. The Monroe case involved horrific allegations of racial abuse at the hands of 13 Chicago police officers who had allegedly broken into a Black couple’s apartment and forced them to stand naked in front of their children as they beat the father with a flashlight, degraded him with racial slurs and ransacked the apartment. The Supreme Court ruled that the officers could be sued under Section 1983, but the city of Chicago could not.

Unsurprisingly, the Monroe decision was met with heavy criticism, and the Supreme Court eventually reversed itself—sort of. In Monell v. Department of Social Services of the City of New York, the high court ruled that cities are accountable under Section 1983, but only if the civil rights violation was caused by “official policy” of the city government. The court’s reasoning was based on a strained reading of the 1871 law, and has been often criticized ever since, but the rule established in Monell has nonetheless survived and evolved.

The Monell Rule is unique to civil rights litigation and exists nowhere else in the legal world. If, for example, an Amazon delivery driver were to negligently cause a traffic accident while on the job, Amazon would ordinarily be liable for the victim’s injuries; there would be no need for the victim to prove that Jeff Bezos or Amazon’s board of directors had caused the accident through their corporate policies or their “deliberate indifference” to the rights of potential accident victims. In the civil rights context, however, that is essentially what the Monell Rule requires. In simplest terms, the Monell Rule is a barrier to government accountability. It puts legal distance between city governments and their employees, allowing cities to avoid responsibility for the on-the- job conduct of their own police officers.

As a practical matter, the Monell Rule blocks the only pathway by which civil rights victims can hold police departments accountable. Victims of police violence have three basic avenues to justice: criminal prosecution of the individual officers involved; a civil lawsuit against the same officers; or a civil lawsuit against the municipality that employs them. The first two avenues have their own unique challenges, such as the high burden of proof in criminal cases, or the qualified immunity standard that protects individual police officers from liability in civil suits. But the first two avenues—even where successful—punish only the individual officers. It is only the third avenue that has the potential to impact municipal police departments as a whole, and the Monell Rule blocks that avenue like a barricade.