In Florida what happens when the police arrest you without reading your rights?

The police have to read you your rights ONLY IF they want to question you and use your answers against you later in a court of law. If you have made a statement and the police have not read you your rights AND a judge thinks that this really what happened, then your statement cannot be used against you at trial. Obviously it is going to be your Word against the police. You can still be prosecuted as long as there is enough evidence without using the statement. Other than that, the police do not have to tell you anything.