What really happens if the police fail to read a suspect his rights.

Many people believe that if they are arrested and not "read their rights," they can escape punishment. Not true. But if the police fail to read a suspect his or her rights, they can't use anything the suspect says as evidence against the suspect at trial.

Miranda Warnings

Popularly known as the Miranda warning (ordered by the U.S. Supreme Court in Miranda v. Arizona), a defendant's rights consist of the familiar litany invoked by TV police immediately upon arresting a suspect:

• You have the right to remain silent.
• If you do say anything, what you say can be used against you in a court of law.
• You have the right to consult with a lawyer and have that lawyer present during any questioning.
• If you cannot afford a lawyer, one will be appointed for you if you so desire.
• If you choose to talk to the police officer, you have the right to stop the interview at any time. (This part of the warning is usually omitted from the screenplay.)

When the Miranda Warning Is Required

It doesn't matter whether an interrogation occurs in a jail or at the scene of a crime, on a busy downtown street, or the middle of an open field: If a person is in custody (deprived of his or her freedom of action in any significant way), the police must give a Miranda warning if they want to question the suspect and use the suspect's answers as evidence at trial.

If a person is not in police custody, however, no Miranda warning is required and anything the person says can be used at trial if the person is later charged with a crime. This exception most often comes up when the police stop someone on the street to question him or her about a recent crime or the person blurts out a confession before the police have an opportunity to deliver the warning.

Pre-Arrest Questioning

People are often surprised to learn that if a person hasn't yet been arrested, the police may question the person and use the answers in court without first providing the familiar "Miranda warning" that advises people of their constitutional right to not answer questions and to have an attorney present if they do decide to talk to police officers.

Responding to Questions Before an Arrest

But does a person have to respond to police questions if he or she hasn't been arrested? A police officer generally cannot arrest a person simply for failure to respond to questions. The Fifth Amendment to the U.S. Constitution guarantees the "right of silence." This means that unless a police officer has "probable cause" to make an arrest or a "reasonable suspicion" to conduct a "stop and frisk," a person approached by the police officer has the legal right to refuse to answer questions. Indeed, a person who has reason to believe that he or she is a potential suspect should politely decline to answer questions, at least until after consulting an attorney.

This general rule may not hold true if the officer suspects the person of loitering. Laws in effect in many states generally define loitering as "wandering about from place to place without apparent business, such that the person poses a threat to public safety." Under these laws, if a police officer sees a person loitering, the officer can demand identification and an explanation of the person's activities. If the person fails to comply, the officer can arrest the person for loitering.