People can be taken into protective custody without any suspicion they committed a crime, though typically this is mostly done with children and they're taken t

People can be taken into protective custody without any suspicion they committed a crime, though typically this is mostly done with children and they're taken to foster care, not county detention. It has been used in the past to protect people from getting lynched after being publicly accused of a crime even if the police don't suspect them, and is used to protect confidential informants by arresting them along with everyone else just to keep up appearances, though in this case they usually agree to it in advance.