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The government responded Monday that the FBI “studiously followed the law of interrogation” and that Mr. Shibin was “fully capable of understanding his rights and making an informed and voluntary decision regarding whether to speak to the agents without an attorney present.”

Mr. Shibin is charged with piracy, kidnapping and weapons charges in the February hijacking of the yacht Quest. He has pleaded not guilty.

Prosecutors have said Mr. Shibin never boarded the Quest, but operated from Somalia to determine how much ransom the hostages could fetch. He is considered the highest-ranking suspected pirate the United States has prosecuted.