Below is the data for clearance rates by crime.
Homicide Clearance has been from 90% in 1960 to 70% in 2000 (harder to find data.)
Which is why we see so many repeat offenders before apprehension.
Homicide Clearance has been from 90% in 1960 to 70% in 2000 (harder to find data.)
Clearance Rates by Arrest (US Data 2008 approximated)
1. Forcible Rape 40%
2. Robbery
__Firearm 20%
__Non-Firearm 30%
3. Aggravated Assault
__Firearm 40%
__Non-Firearm 60%
4. Burglary 10%
5. Motor Vehicle Theft 10%
6. Arson
__Mobile 10%
__Non Mobile 20%
http://www.fbi.gov/ucr/cius2008/data/table_27.html
Which is why we see so many repeat offenders before apprehension.