Sometimes they might drop the charges ... but, why should the state drop them? They have a crime and a confession - it seems they have a pretty strong case to at least ask for probation, community service, etc. A deferred entry of judgment may be possible depending on the laws in your un-named state. He's not likely to just skate out of this one, though.
Hopefully he will learn from it so that he never does it again!
- Carl