Every year about 4,000,000 Americans are arrested and accused of crimes ranging from theft and traffic violations to murder. The Supreme Court has ruled that anyone charged with a crime has certain rights under the law. Do you know what your rights are if you are arrested? Here are four of them. First, as soon as the police arrest a person, they must tell him of his right to remain silent. Under the law, he is not required to answer their questions. Second, the police must tell him of his right to have a lawyer. The state or city government will pay a lawyer to take the case of a suspect who cannot afford one. Third, the Fifth Amendment(修正案) to the Constitution says that no person has to be a witness against himself. This means that the suspect does not have to speak against himself. Fourth, a person can not be tried for the same crime twice. If a person has been found innocent, he cannot be arrested again, brought to court, and retried for the same crime. What does the word 'ruled' mean?