The International Center for Prison Studies (ICPS) has just published its updated World Prison Population list. http://www.prisonstudies.org/news.html. It shows that the rate of incarceration in Haiti is a fraction of its Caribbean neighbours. Haiti imprisoned 55 people per 100,000 of population in 2010, compared to 174 in Jamaica, 213 in the Dominican Republic, 303 in Puerto Rico and 382 in The Bahamas. But according to a 2010 study by the European Institute for Crime Prevention and Control, Haiti's Canada-funded prisons are among the most crowded in the world. And according to the same study, Haiti's prison system has among the highest rates of preventive detention (jailed without charge or conviction) in the world. The preventive detention rate is 68%, according to the ICPS, using published U.S. government figures. Other report place the figure at 80%.
According to a referenced document posted to Wikipedia, Haiti's homicide rate is comparable to the Dominican Republic and slightly higher than many Caribbean island neighbours. http://en.wikipedia.org/wiki/List_of_countries_by_intentional_homicide_rate. The document says the highest homicide rates in the world are in Jamaica, El Salvador, Honduras and Guatemala. (Coincidentally, all of the four named countries have been victims of harsh, U.S.-supported political/military intervention in recent decades.) Haiti's (and the DR's) homicide rate is about one third of those countries.
While Haiti suffers serious problems of crime and social violence, the provision of "security" as used by foreign police and military forces since 2004 is considered by many Haitians as code for, "We run Haiti, not you. Challenge to our authority will be met with force."