Below is the link to the study of the United Nations on Drugs and Crime in relation to the Balkans region. Contrary to popular belief in the region, the study concludes that "the Balkan region is one of the safest in Europe" and that "the levels of crime against people and property are lower than elsewhere in Europe."
Major section titles illustrate that "the Balkans do not fit the profile of a high crime region". The important fact to understand is that "the Balkans do not have a conventional crime problem" but that the real problem is organized crime and corruption.
The stability of the region after the conflict in the 1990's is an important factor that causes the declining opportunities for organized crime.
The original study is here: http://www.unodc.org/documents/Balkan_study.pdf