DOJ drops charges against Russian researcher accused of smuggling frog embryos

A federal judge dismissed all criminal charges against Kseniia Petrova, a Russian-born scientist working at Harvard Medical School, who was accused of smuggling frog embryos into the United States. The case began when Petrova was detained in February 2025 while returning from France, where she collected research samples for her work on aging and cancer. Prosecutors originally charged her with one count each of concealment of a material fact, false statement, and smuggling goods into the country.

The prosecution faced significant setbacks after it emerged that customs officials had improperly canceled Petrova’s visa in April 2025, leading to further investigation by federal judges who ruled that the case warranted scrutiny over potential vindictive prosecution. Defense attorneys argued that the government's actions were motivated by her immigration status rather than legitimate concerns about illegal activity. Prosecutors decided to drop the charges on November 4, 2026, citing resource costs and limited public interest in continuing the case against a researcher who posed no danger or threat.