If he or she stops you on the street or in a car, and is going to ask you questions, you need to know that you have the right to remain silent. You do not have to answer questions, and may state so directly. Furthermore, if he or she asks you to perform any tests you do not have to perform them, or asks for your consent to search either you or your car, you do not have to give it. Be aware, however, that exercising your rights may not make the officer happy, but it will protect your rights as a citizen. Subsequently, if arrested by a police officer, your best defense is an experienced criminal lawyer who knows how to guide you through the legal maze.
Crimes come in many different severity levels.
Moreover, individuals can be charged at the State and Federal level with a variety of offenses. Which one of these you are charged with, and the potential penalty depends on the specific facts of the case and your past criminal history. In helping you understand the type of charge and punishment you are facing, you need to consult with lawyers that know the system and are experienced with handling all levels of criminal cases. If you are have been placed in custody and are arrested, the police may come to ask you questions. If they do, police are required to read you your Miranda rights.