According to inves­tiga­tive report­ing from the AZ Mirror, the Arizona Department of Corrections, Rehabilitation, & Reentry (ADCRR) is stor­ing the state’s sup­ply of pen­to­bar­bi­tal salt, the active ingre­di­ent used in a com­pound­ed form in lethal injec­tion exe­cu­tions, in eight unmarked glass con­tain­ers in a prison refrig­er­a­tor