The paper is aimed at addressing the provocative issue of possible limits under international law barring the trial of foreign judges and prosecutors for their activity abroad and the reasons for the apparent rarity of situations in which foreign judges and prosecutors are subject to criminal proceedings. Lacking of comprehensive sociological and criminological information about the dimension of judicial involvement in the commission of crimes, but driven by the consideration that most dictatorships rely on a judicial system, the paper focuses rather on possible legal reasons for the rarity of "trialing foreign judges" situations.