The 41 officials in England and Wales, who were first elected in 2012, oversee non-operational aspects of policing such as managing their local policing budgets and holding the chief constable to account.
Introduced by the Conservative-Lib Dem coalition government, they replaced police authorities.
Although candidates can stand as part of a political party, police and crime commissioners (PCCs) are required to swear an oath of impartiality before taking office.
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