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May a death-row prisoner use 42 U.S.C. § 1983 to challenge a state’s proposed method of execution as cruel and unusual under the Eighth Amendment, when his proposed alternative method of execution is not presently authorized under the extant state law?

Whether the district court committed reversible error in excluding mitigating evidence that Dzhokhar Tsarnaev’s older brother had previously committed three brutal murders in the name of jihad, where the defense’s central mitigation theory was that he had acted under his brother’s influence and had a lesser role in the offense.