An internal investigation from a police department should be conducted by a department which is not directly related to the people (police officers) who are bei

An internal investigation from a police department should be conducted by a department which is not directly related to the people (police officers) who are being investigated. The reason for this, is to avoid conflict of interest. If such doesn't happen in your country, that makes your country less free than it IMO should be, but don't assume its like this everywhere in the world.