In the former Soviet Union, religious practices and institutions were outlawed for decades, so Sidorov’s parents and grandparents never received a ketubah, a Jewish marriage certificate. “The rabbis suspected that my grandmother had been adopted because she was born more than five years after my great-grandparents got married,” Sidorov said. “They strongly suggested that my grandmother undergo a DNA test to prove her connection to my great-grandmother’s blood relatives.”Following the rabbi’s suggestion wasn’t an option. Although a DNA test may provide clues about Jewish ancestry, Judaism isn’t just about genetics, Farber emphasized. And it should be emphasized that a DNA test is not used to determine Jewish status in accordance with Jewish law and only to assist in the clarification process.”Farber rejects Lau’s claim that the DNA tests are voluntary.