- number of murder arrests fell by half and both adult and juvenile arrest rates (the number of arrests per 100,000 people) fell to their lowest levels since at least 1990,
- forcible rape arrest rate fell 59%,
- aggravated assault arrest rate fell 31%, and
- simple assault arrest rate remained largely unchanged even though the female arrest rate rose 75% and the male arrest rate fell 12%.
The report notes a number of limitations to the FBI's data. In addition, the number of arrests is not the same as the number of crimes committed and arrest trends cannot be assumed to match crime trends.
Read the full report, "Arrest in the United States, 1990-2010."