Theranos Inc founder Elizabeth Holmes and the blood-testing technology firm’s former president, Ramesh “Sunny” Balwani, have asked a federal judge to block prosecutors from enforcing a grand jury subpoena seeking thousands of records from the failed Silicon Valley startup.

Holmes and Balwani in a motion filed Friday in federal court in San Jose, California said prosecutors were improperly using a grand jury to obtain evidence in the case after they were already indicted.

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