Question

the act of being kept in illegal custody by the police​

Answer 1

Answer:

The act of being kept in illegal custody of police can be referred to an illegal detention.

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Answer 2

The act of being kept in illegal custody by the police​ is called Detention.

• Detention is the process of a state or a private citizen lawfully detaining a person by taking away their freedom or liberty at the time.
• This could be owing to (pending) criminal charges brought against the person in the course of a prosecution, or to protect a person or property.
• Being detained does not always imply being brought to a specific location (often referred to as a detention center) for interrogation or punishment for a crime (see prison).