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Assuming the detainer is a police officer, in many jurisdictions this would be considered unnecessary force, i.e. illegal, and would likely result in the detainee having to be released. Police fo...
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#2: Initial revision
Assuming the detainer is a police officer, in many jurisdictions this would be considered unnecessary force, i.e. illegal, and would likely result in the detainee having to be released. Police forces in many nations are bound by principles of [criminal justice ethics](https://en.wikipedia.org/wiki/Criminal_justice_ethics), and in fact, there are laws that police officers must adhere to in order to avoid [misconduct](https://en.wikipedia.org/wiki/Police_misconduct). Your officer is likely fully aware that misconduct will badly affect the case she is working on, so unless her behaviour is driven by personal factors rather than professional ones (e.g. fear, hatred, revenge, prejudice), this is likely too brutal.