In most countries, candidates for the police force must have completed some formal education. [citation needed] Increasing numbers of people are joining the police force who possess tertiary education[citation needed] and in response to this many police forces have developed a "fast-track" scheme whereby those with university degrees spend two to three years as a Constable before receiving promotion to higher ranks, such as Sergeants or Inspectors. (Officers who work within investigative divisions or plainclothes are not necessarily of a higher rank but merely have different duties.)[citation needed] Police officers are also recruited from those with experience in the military or security services. In the United States state laws may codify statewide qualification standards regarding age, education, criminal record, and training but in other places requirements are set by local police agencies.