If you are detained by police and not allowed to leave freely, police must read you the Miranda Warning so that you fully understand your rights regarding being questioned. If the police do not intend to use those answers against you at a trial, they do not need to ‘Mirandize’ you.
Any defense attorney would want their potential client to take advantage of one of the most important rights in the Miranda Warning: the right to remain silent. It is certainly more difficult to defend a client who has freely admitted guilt to a crime or given such information as to be easily incriminated.
The Miranda Warning, in protecting an individual’s Fifth Amendment rights not to self-incriminate, allows you to decline to answer questions unless you have an attorney present or until you have consulted with your attorney.
Evidence that you might unwittingly give before you have been Mirandized should not technically be used against you at a trial, but the law is complex and intricate and you should not count on evidence being dismissed if you were not Mirandized and you gave the information freely.
If you have been Mirandized and you waive your rights, meaning you wish to speak to police freely without an attorney present, you can change your mind at any time and ‘plead the fifth,’ meaning you no longer wish to answer questions, or that you have changed your mind and wish to have an attorney present after all.
If the police unreasonably and illegally find evidence against you and they have violated your rights by not reading you the Miranda Warning in a timely fashion, there is a rule called ‘fruit of the poisonous tree’ that makes such evidence inadmissible in a court of law. However, police may be able to prove that they would have found such evidence without your cooperation, and therefore they have the right to use that evidence at a trial. Be cautious about relying on any such intricate defenses. Choose the ‘right to remain silent’ option as your best choice and talk with a lawyer about your case.