Whether defendants may be prohibited from asking cooperating witnesses and former co-conspirators about their sentences and sentencing agreements to expose bias

QUESTION PRESENTED Whether, under the Sixth Amendment to the United State Constitution, defendants may be prohibited from asking cooperating witnesses, and former co-conspirators, details about their sentences and sentencing agreements with the government to expose the witnesses' bias? il PARTIES Pablo Santana Arellano is the petitioner; he was the defendant-appellant below. The United States of America is the respondent; it was the plaintiff-appellee below. lll