A Russian geneticist living in Virginia has been sentenced to probation in federal court after pleading guilty to smuggling test tubes with DNA from endangered species into the U.S.

Customs agents were alarmed at their discovery last August at Dulles International Airport: an undeclared cooler packed in a suitcase and filled with 10 test tubes of an unknown yellowish substance, brought to the U.S. by a woman claiming to be a Russian scientist.

Authorities scrambled to uncover the truth: The woman was indeed a respected Russian scientist. The test tubes were not dangerous, but contained DNA samples of endangered species, including Siberian crane, that were related to her work as a geneticist with the Institute of Molecular and Cellular Biology in Novosibirsk.