Russian investigators first announced that a man named Alkhazur Bashayev — who was conveniently dead, killed in a security operation — was responsible for Estemirova's murder. They then prosecuted a living man named Dzhalaudi Gireev, who was convicted and later acquitted by the Russian Supreme Court in 2021. What does the existence of these two mutually exclusive prosecutorial theories — one involving a dead suspect, one a living one — logically prove about the integrity of at least one of the two proceedings?