The judge said a customs officer had acted improperly in stripping Kseniia Petrova, a researcher at Harvard Medical School, of her visa after she failed to declare research samples she was carrying into the country.A federal judge on Wednesday said she would grant bail to Kseniia Petrova, a Russian scientist employed by Harvard University, in an immigration case stemming from Ms. Petrova’s failure to declare scientific samples she was carrying into the country.“There does not seem to be either a factual or legal basis for the immigration officer’s actions” in stripping Ms. Petrova of her visa on Feb. 16, Christina...