Is this case fightable and can they hold this against him? It was verbal he said/ she said

So my fiancé of 10 years is a registered sex offender from back in 2005. Last week July 26 2013 he was arrested for an incident on july 24 2013. They are trying to charge him of Attempt to entice a child minor. I asked him Sunday july 28 2013 when I went to visit him what happened that day. His explanation was that He had been coming home from the hospital due to the fact he had cut his finger open at work and seen a group of teens walking. He stated he had asked if any of them happened to have a cigarette and did a smoking gesture. They filed a statement saying he made a sexual gesture with his hand. Now my question is how can he get his case dismissed. If he is innocent?