Abu-Ali Abdur'Rahman, et al., Petitioners v. Tony Parker, Commissioner, Tennessee Department of Corrections, et al.

Does a state deprive condemned prisoners of due process when, to defeat a challenge to the state’s method of execution, state officials rely on and the state courts credit testimony regarding privileged communications that the prisoners could not effectively challenge through cross-examination or otherwise because they were barred from reviewing the privileged material and from access to the witnesses covered by the privilege?