Questions on UCR Data:

Could it affect the overall UCR data that it is collected on a voluntary basis by contributing law enforcement agencies, and could the fact that state statutes differ from state to state and from the FBI’s definition of certain crimes significantly affect the data? (That seemed like it could cause some problems to me.)

The website mentions that it discourages ranking law enforcement agencies and using the data as a measurement of the effectiveness of the various agencies. What would be a way to compare and analyze the effectiveness of different agencies rather than ranking them based on the data? Crime per capita, or something of that nature?