Not necessarily. The Grand Jury may have continued their investigation, the state may have asked for additional time to further investigate. Does the letter indicate whether the charges were dropped with or without prejudice?
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Only the state can press criminal charges. However, the state may decide to press trespass charges. If there were minors at this party, you could potentially be charged with contributing to their delinquency. Any damage at all can result in criminal damages charges. If the person who invited you to the party did not have authority to throw a party, and you had reason to know that he was without authority, there may be a problem there too. If there were any drugs at the party, possible drug...
Plead not guilty and get an attorney! You have too many collateral consequences at stake. Even a diversion program has risks. As for never calling 911 for anything, ever, you may want to rethink that in case of an emergency.
A 17 year old can be tried as an adult. The matter can also be handled in juvenile court. If you are contacted by police do not answer any questions! Tell the police that you will not speak to them without both your parents and an attorney present. Some attorneys provide pre-indictment services. This means he/she will contact the investigating officer, try to get you summoned rather than arrested, ensure warrants do not go out without your knowledge, etc.
The best way is to retain an attorney. Often no prosecutor is assigned to a traffic case unless the defendant hires counsel. Once a prosecutor is assigned, plea negotiations can take place, which often does not occur when a driver represents himself.
This will depend upon a wide variety of factors. As a general rule a non-dangerous, non-repetitive cl. 4 in Arizona is 1 to 3.75 years but is probation eligible if the Court finds mitigating circumstances. From your description, the Court may also find aggravating circumstances.
You need to consult with a criminal defense attorney. I am not sure what you mean by "not abandon" from the store, but one of your release conditions may be to stay away from Walmart. Make sure your read your release conditions.
You may want to ask if the attorney offers flat fee services. Flat fee services are not charged down on an hourly basis.