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The Kseniia Petrova charges are on their way out. Federal prosecutors in Boston filed papers on Tuesday, Nov. 3, to dismiss the smuggling and false statement case against the Russian-born Harvard Medical School researcher whose J-1 visa was cancelled at Logan Airport in February 2025 over undeclared frog embryo samples, a move that came weeks after a judge ordered the government to open its files on her claim of vindictive prosecution.
The filing, signed by U.S. Attorney Leah B. Foley for the District of Massachusetts, said continuing the case “would divert significant time and attention from more substantial federal interests” and that “the resource costs of continuing this prosecution outweigh the public interest in its resolution,” according to Cambridge Day, which reported the filing Tuesday night. Reuters reported that prosecutors still called her vindictiveness claims “meritless.” No ruling on the request has been reported, and Cambridge Day said a status conference was set for the end of November.
A retreat that follows the discovery fight
The timing is the story. In April, Magistrate Judge Judith G. Dein found that Petrova was entitled to discovery on her selective and vindictive prosecution claims, and on Oct. 8 U.S. District Judge Leo T. Sorokin rejected the government’s appeal, writing that the magistrate’s decision was “neither contrary to law nor clearly erroneous,” Cambridge Day reported. Reuters described the dismissal as coming after a federal judge “cleared the way” for her to obtain that evidence.
Defendants rarely get that far. Vindictive prosecution claims require a showing that the government charged someone to punish the exercise of a legal right, and courts seldom let defendants dig into prosecutors’ internal records to prove it. Once that door opened, the government faced a choice between producing the records and dropping the case. Dismissal, if the court grants it, is likely to make the discovery order moot, so whatever those files contain may never be produced.
Petrova, who pleaded not guilty, faced charges of smuggling and making false statements, according to Reuters, which reported that her supervisor had asked her to bring the samples back from France. “We are relieved that this chapter of her terrible ordeal will soon be over,” her lawyer, William Fick, told Reuters. A spokesperson for Foley declined to comment.
The visa question was settled in Vermont
For immigration practitioners, the more consequential ruling came earlier. In April 2026, U.S. District Judge Christina Reiss in Burlington, Vermont, held that a Customs and Border Protection officer had no authority to cancel Petrova’s J-1 visa for a customs violation. “The undisputed facts reveal that Ms. Petrova’s visa was impermissibly canceled because of the frog embryo samples and for no other reason,” Reiss wrote, according to VTDigger, which reported that she called the action arbitrary and capricious.
That holding draws a line CBP officers work along every day. Failing to declare goods is ordinarily a customs matter, handled through seizure and civil penalties, while cancelling a visa and treating a traveler as inadmissible are immigration decisions that need their own legal basis. The Vermont ruling says an officer cannot borrow the first to justify the second. A single district court decision does not bind other judges, but it gives researchers and exchange visitors turned around at the airport a reasoned ruling to cite, a point that has grown more pressing as State Department visa revocations have mounted.
The immigration side is not fully closed. Her immigration lawyer, Gregory Romanovsky, filed a motion last week in Vermont federal court seeking $245,000 in fees, arguing she prevailed on both her Administrative Procedure Act claim and her request for release from immigration detention, Cambridge Day reported, with the government’s response due next week. None of the reports reviewed say whether any removal case against her remains open or what her current visa status is, and those are the questions that will decide whether she can keep working in the United States.
The case fits a broader pattern of federal judges scrutinizing how immigration authority is used against people with lawful status, from ICE re-arrests after habeas wins to the release of a Canadian dentist detained in Minnesota. The practical lesson for scientists who carry biological material across the border is unchanged by the dismissal: declare it. What the Petrova rulings add is a limit on what CBP can do when someone does not.
This article is for general information and is not legal advice.
Sources
- Reuters (via WSAU), US moves to drop smuggling charges against Harvard scientist (Nov. 3, 2026)
- Cambridge Day, Government asks charges against Kseniia Petrova be dismissed (Nov. 3, 2026)
- VTDigger, Vermont judge says U.S. Customs leapt too far in frog embryo case (April 10, 2026)
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