Many security service organizations do not carry guns. Numerous extra licenses and training courses are normally necessary in order to carry a handgun. These rules, however, differ by state. In California, for example, all candidates must get a license from the California State of Fair Trading Bureau of Security and Investigative Services. You must be at least 18 years old and agree to a complete criminal background check done by the California Department of Justice and the Federal Bureau of Investigation. The school is around 40 hours long and involves significant hands-on instruction, such as how to conduct an arrest and use a range of firearms. After an applicant has a license, extra steps need to be followed before seeking work. Additionally, a yearly 8-hour follow-up course is necessary following the individual's successful introduction into the workforce.