Your best bet is to get an attorney. Discuss all of the issues in private with your attorney. You can be charged with anything, but the prosecutor has to show probable cause in order to move forward. Your attorney can explain this. Remember get an attorney now, not later and protect your legal rights.
This is not legal advice only general information. Should you seek legal advice you should talk personally with an attorney.
Although you do not specify what the police found in the vehicle or other operative facts (and you do NOT want to do that here anyhow), there is nothing to stop the prosecutor from charging you. However, that does not mean that they can prove the charges. There may be search issues and other possible defenses which may help you avoid any conviction.
The legal issues (like "plain smell") in your case appear to be complex and will require analysis by an experienced criminal defense attorney who is also familiar with your local court system, prosecutors and judges. Contact a lawyer immediately and do not speak with anyone about the facts of your case until then.
Dan J. Weisenburger
Attorney at Law
The simple answer is is that the police and charged with contributing to the delinquency of a minor, since you were the adult in the car. This is not a good situation to be in. I suggest that you obtain legal counsel immediately. My colleagues who have also answered this question are correct.
In addition, if you are in a car with third parties and they engage in illegal acts, it is common for all parties in a vehicle to be charged with conspiracy or complicity to those acts. In other words, you can also be charged with use or possession of marijuana, which carries significant implications in Ohio to your drivers license and since you are an adult carries far more severe penalties for you than for the juveniles in the vehicle. They get charged in the juvenile court. You get charged in municipal court.
My suggestion is that you lawyer up. Good luck.
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