Although the question of whether justice can actually be served is no trifling matter, the fact that any trial should even be attempted is a huge triumph in a country where impunity has been the order of the day in these types of cases for as long as anyone can remember.  At some point, we have to believe that having a trial and not getting a conviction is better than not having a trial.  Having said that, however, I wonder if this case may not be better suited for a special court, some kind of war crime tribunal with international legal experts and investigators, rather than your run of the mill criminal proceeding.  Certainly, the investigation required will need to rely on expert opinion, scientific evidence, and require major investigative resources.  If this case is conducted properly, it could set a highwater mark not only for El Salvador but for the region.