US judge dismisses frog-embryo smuggling charges against Harvard researcher Kseniia Petrova
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The gist
A federal judge dismissed smuggling charges against Harvard researcher Kseniia Petrova over undeclared frog embryos.
The case drew scrutiny of how hard-line immigration policy treats foreign academics.
Background
Kseniia Petrova is a 31-year-old Russian researcher at Harvard University who was accused of smuggling frog embryos into the United States. She was detained in February 2025 at Boston's Logan International Airport while returning from a vacation in France, where she had obtained a package of embryo samples for research, and spent four months in detention. Prosecutors later moved to drop the case, and her case was described as an early example of the administration's hard-line immigration policies, which have had a chilling effect on foreign students and academics.
How it unfolded
- Feb 2025Kseniia Petrova is detained by customs agents at Boston's Logan International Airport for carrying undeclared biological samples.
- May 2025The Justice Department charges Petrova over the "noninfectious and non-toxic frog embryos."
- Apr 2026A district court judge in Vermont rules in a separate immigration case that Petrova's visa had been "impermissibly canceled."
- Nov 3, 2026U.S. Attorney Leah Foley files a motion to dismiss the charges, citing "developments in this case and an assessment of the office's priorities and resources."
- Nov 4, 2026U.S. District Judge Leo Sorokin grants the request to dismiss the smuggling charges and counts alleging concealment of facts and false statements.
Key terms
- smuggling
- The illegal and often covert transportation of goods, substances, people or intelligence across a border in violation of applicable laws.
- visa
- An official document issued by a government allowing a foreign person to enter, stay, or leave that country.
Source: Wikipedia
Who’s saying what
- Official
- Prosecutors said continuing the case would "divert significant time and attention from more substantial federal interests" and that its resource costs outweigh the public interest.
- Support
- Petrova's attorney Daniel Marx said the DOJ "never should have brought this highly unusual 'smuggling' prosecution" and that her handling of the samples "never posed any danger to anyone."
- Caution
- Judge Sorokin said the "defendant's claims of vindictive and selective prosecution are meritless," and prosecutors called her accusations of government overreach "meritless."
Still unverified
Petrova's lawyers argued the criminal prosecution was vindictive, saying the government only filed charges after it looked like she would win her immigration case; the judge called these claims meritless. Petrova told the AP she did not realize the items needed to be declared and was not trying to sneak anything into the country.