Buck v. Stephens

Did the United States Court of Appeals for the Fifth Circuit impose an improper and unduly burdensome Certificate of Appealability standard t when it denied Duane Buck a COA on his motion to reopen the judgment and obtain merits review of his claim that his trial counsel was constitutionally ineffective for knowingly presenting an "expert" who testified that Mr. Buck was more likely to be dangerous in the future because he is Black, where future dangerousness was both a prerequisite for a death sentence and the central issue at sentencing?