Drinking with minors is a bad idea—even if you didn't actually purchase the alcohol they drank, even just handing them a can from the cooler can result in a conviction, or even driving them to the store or the place where you were drinking can result in a conviction. And, of course, if the police claim that they saw you do any of those things, it's just your word against theirs.
Yes, the police have two years to charge you for furnishing alcohol to minors, and can do so at any time. That said, it is rare that the police go back and issue citations after deciding not to do so at the scene. In the event that you are cited, speak with a local defense attorney to discuss possible defenses like pre-arrest delay, prosecutorial misconduct, and defects in the officers' credibility based on the timing of their charging decisions.
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