A "call for service" refers to any documented police activity which is classified as a crime or complaint. Calls for service encompass a variety of criminal and non-criminal events.
For statistical purposes, calls for service are grouped into one of the three major categories:
- Group A Crime
- Group B Crime
- Non-criminal Activity
Often, criminal offenders commit several different crimes during one criminal act. Therefore, Group A and B crime is further broken down into incident and offense categories.
For example: A police officer responds to the report of a shoplifter. During the search of the offender the officer finds narcotics and stolen property. For classification purposes, the cited example represents one incident (shoplifting) and three offenses (one offense of shoplifting, one offense of possession of narcotics, and one offense of possession of stolen property).
Historically, non-criminal activity comprises the majority of calls for service responded to by Troy police officers. Alarms, abandoned automobiles, medical emergencies, traffic crashes, etc. are examples of the types of calls that comprise the "non-criminal" category.
Clearance Rates
The phrase "clearance rate" refers to the percentage of crime solved. In order to clear a crime, one of the following circumstances must occur:
- The offender is arrested, charged, and turned over to the courts
- The offender is killed
- The offender confesses but is not prosecuted because he/she is already serving a sentence or facing other charges
- The offender provides a deathbed confession
- The offender is in the custody of another state and cannot be returned to Michigan
- The offender is identified but the victim refuses to cooperate
Crime clearance rates depend on many factors. Crimes such as vandalism are difficult to solve due to the lack of witnesses and/or evidence. Others, such as shoplifting or possession of stolen property, are solved because the perpetrator is in custody upon the officers arrival or the crime is actually discovered by a police officer. | View Recent Reports  2009 vs. 2008 annual Crime Comparison
10 Year UCR Incident Trend by Crime Class Group Through 2009 10 Year National Incident based reporting for incidents Through 2009
10 Year National Incident based reporting for Offenses Through 2009
10 Year National Incident based reporting for Arrests Through 2009
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