Русско-англо-русский юридический словарь

Detention is a short period of custody, often occurring while the police are deciding whether or not to arrest you. In order to detain you, the police are supposed to have a reasonable suspicion that you’re involved in a crime. (USLegal)

Let me be clear – it is never acceptable to help people if you know or believe them to have been involved in a crime. (Oxford Mail)