By Canadian Press

Harvard researcher charged with smuggling frog embryos is released from federal custody on bail

Jun 12, 2025 | 9:38 AM

BOSTON (AP) — A judge released a Russian-born scientist and Harvard University researcher charged with smuggling frog embryos into the United States on bail Thursday after a brief hearing.

Kseniia Petrova, 30, who was brought into court wearing an orange jumpsuit, had been in federal custody since February. She was seen walking out of the courthouse laughing and hugging supporters.

Lawyers on both sides came to an agreement on conditions for Petrova’s release, which included limiting her travel. Authorities are still holding onto her passport. Petrova must return to court next week for a probable cause hearing on the smuggling charge.

“I hear it’s sunny. Goodbye,” Magistrate Judge Judith Dein said after approving the agreement.

Petrova was returning from a vacation earlier this year in France, where she had stopped at a lab specializing in splicing superfine sections of frog embryos and obtained a package of samples for research. She was questioned about the samples while passing through a U.S. Customs and Border Protection checkpoint at Boston Logan International Airport.

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After an interrogation, Petrova was told her visa was being canceled.

Petrova was briefly detained by immigration officials in Vermont, where she filed a petition seeking her release. She was later sent to a U.S. Immigration and Customs Enforcement facility in Louisiana.

The Department of Homeland Security had said in a statement on the social media platform X that Petrova was detained after “lying to federal officers about carrying substances into the country.” They allege that messages on her phone “revealed she planned to smuggle the materials through customs without declaring them.”

She told The Associated Press in an interview in April that she did not realize the items needed to be declared and was not trying to sneak anything into the country.

In May, Petrova was charged with smuggling in Massachusetts as a federal judge in Vermont set the hearing date on her petition. That judge later ruled that the immigration officers’ actions were unlawful, that Petrova didn’t present a danger, and that the embryos were nonliving, nonhazardous and “posed a threat to no one.”

The judge released Petrova from ICE custody, but she remained in the custody of the U.S. Marshals Service on the smuggling charge before her release Thursday.

Colleagues and academics have testified on Petrova’s behalf, saying she is doing valuable research to advance cures for cancer.

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Associated Press reporter Kathy McCormack in Concord, New Hampshire, contributed to this story.

Leah Willingham, The Associated Press