A federal judge in Vermont has ruled that U.S. Customs and Border Protection unlawfully canceled the visa of Kseniia Petrova, a Russian scientist affiliated with Harvard University. The decision represents a significant legal victory for Petrova in her ongoing case.

Petrova, who is Russian, has been charged with smuggling frog embryos into the United States in her luggage. The scientist spent four months in detention following her arrest and the cancellation of her visa by customs officials.

The federal court's finding that the visa cancellation was unlawful raises questions about the procedures used by U.S. Customs and Border Protection in Petrova's case. The ruling addresses the administrative action taken against her visa rather than the underlying criminal charges she faces.

The case highlights the intersection of immigration enforcement and scientific research, particularly involving foreign nationals working at U.S. academic institutions. Petrova's prolonged detention and the subsequent court ruling have drawn attention to customs procedures affecting international researchers.

While the judge's decision regarding the visa cancellation provides Petrova with important legal relief, she still faces the separate criminal charges related to the alleged smuggling of biological materials. The outcome of those charges remains pending in the ongoing legal proceedings.