The use of force is governed by who?

The use of force:

In law enforcement, the use of force describes the power, force or other tactics that the police use to get information from individuals who refuse to comply with the investigation. The law enforcement group legible for use of force are military personnel and law enforcement officers.

This technique or doctrine has to be used to guarantee the safety and also ensure the process is ethical to protect the perpetrators.

Failure to act ethically may result in the claim of self-defense against officers. Officers have been criticized to abuse their power when employing this technique for many years. Therefore, in recent years, they are required to wear a web camera and to switch it off during the interaction with civilians.