Not All Criminals Are Apprehended Immediately, and a Police Agency Is Required
Their main function is enforcing the law.
Many criminals flee the scene of the crime and are not apprehended immediately. Especially for crimes such as burglary where there might not be witnesses, it can take weeks or even months to track down a criminal. This is even truer for highly intelligent serial criminals. Serial rapists or murderers often continue committing crimes for years, and only a concentrated effort from the police can stop them. Overall, on average the police make upwards of 10 million arrests annually.