I can add to that, I have some examples.
In the first five months of 2013, the former special prosecutor for human rights opened more than 400 cases examining police abuse, misconduct, and murder. A United States Senate caucus report on international narcotics controls states that criminal networks in Central America have been closely linked to the government and military elites. In November, 2011, the then Honduran security minister Pompeyo Bonilla estimated that 1,000 members of Honduras' police force were corrupt. Again, as Carmen said, an international observer said that his office operates under the assumption, as of course, that narco-trafficking groups have established links with politicians, the army, and the police.
So corruption has meant that there is an increased likelihood that there are state actors involved in crimes against journalists, and that those who are responsible for investigating these crimes have been unwilling and unable to do so, clearly.