Because crime is a major concern of all citizens and their law enforcement agencies, people everywhere have looked for ways to protect themselves, their families, and their neighbors. In the United States today, more than 13 million crimes are committed each day. That's about a 50 percent increase in crime in 10 years. Law enforcement alone cannot solve a problem that has accelerated at such a rapid pace. Police officers at every level are now looking to the average citizen to make the work of the criminal as difficult as possible, especially in residential areas.