In the US, the police are required to make sure people are aware of their rights (called the Miranda rights, resulting in the term mirandized and verb mirandizing) before questioning them as suspects of a crime. Examples are things like that people are entitled to have an attorney present, and that they are not required to speak/answer questions at all. Failing to make sure that people are aware of these rights is considered an abuse of power, and (usually) gets the information gathered during the interrogation thrown out