You will need a competent Miami lawyer to assist you. It is strange the cops charged you intent without paraphernalia or baggies. It could be the cops based it upon other factors they found at the scene including the amount of grams they discovered. Miranda is a tricky question and a lawyer can not analyze that for here without t more facts known. Hire a lawyer to try and get the state to not file the intent charges and perhaps seek out a first offender program like diversion or intervention where you can get the charges dropped. Good luck!
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The first thing is to hire a competent criminal defense attorney ASAP. You have to concerns: the CRIMINAL charge and the CIVIL car accident to deal with. The search of the vehicle, your "consent", the lack of a "Miranda" warning may or may not affect the outcome of the criminal case. Get counsel now.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..
You should hire a competent criminal defense attorney ASAP. There may be issues with the legality of the officer's actions but more information is needed to determine that.