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No law degree is required to get the gist of the ruling U.S. District Judge Valerie Caproni handed down on Tuesday. Sure, the decision—the latest blow to the Trump administration’s efforts to weaken environmental laws—is marbled with the typical Latin and legalese. But beginning with its opening nod to the novel To Kill a Mockingbird, Caproni’s ruling in the Southern District of New York makes it plain that the Interior Department’s interpretation of the century-old Migratory Bird Treaty Act (MBTA) isn’t merely flawed—it’s flat-out wrong. 

The decision strikes down a 2017 legal opinion issued by Daniel Jorjani, Interior’s top lawyer, which claimed the MBTA did not prohibit “incidental take,” a term for the unintentional but foreseeable and avoidable injury or killing of birds, often through industrial activity. For decades, the U.S. Fish and Wildlife Service (FWS) has used the threat of potential prosecution under the MBTA to convince companies to take steps to prevent killing birds, such as covering oil waste pits or marking power lines to make them more visible to birds in flight. 

Under Jorjani’s opinion, even mass killings of birds—such as the 2010 BP oil spill, which killed an estimated 1 million birds and resulted in a $100 million fine against the company under the MBTA—would not be punishable if killing birds wasn’t the intention. Guided by that interpretation, the FWS has opted not to investigate cases of incidental take, and even counseled companies and local governments that they need not take steps to protect birds. 

Caproni eviscerated that reading of the law. “It is not only a sin to kill a mockingbird, it is also a crime,” . “That has been the letter of the law for the past century. But if the Department of the Interior has its way, many mockingbirds and other migratory birds that delight people and support ecosystems throughout the country will be killed without legal consequence.”

The ruling is a major win for six environmental groups and eight states whose three consolidated complaints argued that the law clearly makes it illegal to kill, hunt, capture, or attempt to capture a bird or egg without a permit “by any means or in any manner.” Caproni agreed, ruling that Interior’s position was “simply an unpersuasive interpretation of the MBTA’s unambiguous prohibition on killing protected birds.” The judge also rebuked Jorjani for issuing an opinion without tapping the expertise of federal wildlife officials. “There is no evidence of input from the agency actually tasked with implementing the statute: FWS,” she wrote.

Conservationists were thrilled at the judgment’s forceful endorsement of their position. “The ruling is completely unambiguous on every count. Every rationale the government gave to try to uphold this rollback of the MBTA, the judge shot them all down,” says Erik Schneider, policy manager for the ̽����ѡ, which was among the plaintiffs. “The experts had no bearing on [Jorjani’s opinion]. It was a political decision made without their input.” 

California Attorney General Xavier Becerra, another plaintiff, said that the ruling “recognizes the critical importance of protecting our precious wildlife and upholding the rule of law. We hope the Department of the Interior and the U.S. Fish and Wildlife Service learn their lesson and renew their commitment to acting in the best interest of the public.” 

People on both sides of the case expect the administration to appeal. “Three circuit courts have already weighed in supporting the opinion underlining the MBTA rule,” said Kathleen Sgamma, president of the Western Energy Alliance—an association of oil and gas companies that lobbied for ending enforcement of incidental take—in an email. “One district court ruling from New York will not be the final word.”

Sgamma’s reference was to other MBTA cases prior to Jorjani’s opinion. Interior cited those earlier rulings as evidence that courts hadn’t settled whether the law covers incidental take and that prosecuting accidental bird deaths was therefore legally dubious. But Caproni found that line of reasoning unconvincing. “Interior’s argument vastly overstates circuit disagreement and blurs the actual boundaries that have been drawn,” she wrote. “Tensions between the circuits certainly exist, but they are not of the magnitude or kind Interior presents.”

Caproni’s decision is a significant blow to Interior’s effort to enshrine Jorjani’s opinion in a formal rule, which would make the allowance of incidental take more difficult for a later administration to reverse. Part of the justification for such a reversal could come from the department’s recent draft environmental impact statement on the proposed rule, which says it is likely to push some bird species onto the endangered species list.

An Interior spokesperson declined to say if the department would continue work to finalize that rule despite the court decision, instead offering an emailed statement: “Today’s opinion undermines a common sense interpretation of the law and runs contrary to recent efforts, shared across the political spectrum, to de-criminalize unintentional conduct.”

Interior also declined to say how the ruling would affect day-to-day enforcement of the MBTA by the FWS. Gary Mowad, who spent 25 years with the FWS and was deputy chief of enforcement, says the agency should return to investigating industrial threats to birds and engaging companies to reduce those threats. “I hope that the Department of the Interior and the Fish and Wildlife Service take the special agents off the leash and let them do their jobs,” he says. “What I fear is that the service always has the ability to establish enforcement priorities, and they may still make this type of mortality a low enforcement priority.”

To buttress Tuesday’s victory, conservationists want Congress to step in and spell out even more clearly that the MBTA does not apply only to killing birds on purpose. The Migratory Bird Protection Act, which has passed a House committee but hasn’t yet received a vote in the full chamber or a companion bill in the Senate, would affirm that the MBTA prohibits incidental take. It also would set up a permitting program whereby companies would be protected from legal action as long as they adopt industry best practices to limit harm to birds. “Congressional action could potentially build on this victory,” Schneider says, “and help provide even greater stability going forward.”