Yes, the information could be used against him. You should speak with a criminal defense attorney in your area.
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Without question, your son should have a criminal defense attorney. The office is not the final say as to the filing of charges. That does not mean your son's attorney has to create a controversy, but the attorney will know where to draw the line. You can pay for the attorney, and you son can pay you back from the savings on not having a cell phone until he turns 18.
We do not have a client/attorney relationship until you make an appointment, we discuss your case face to face, I accept a retainer, and we explictly agree to enter into representation.
Any time you speak with the police they are trying to get information to use against you in the case they are building. You should hire an attorney for your son and be prepared for both criminal and civil action. Just because that officer says there was no crime does not mean that there will not be charges filed later.
I am a licensed attorney in the state of Nebraska. However, the advice I give here is not to be taken as legal advice. It is merely my opinion based on the limited information given. In order to assure that your legal rights are being properly represented I would always recommend going in for a consultation with an attorney to explain your case in detail and answer any questions the attorney might have.