Actually, you should be eligible for an expunction right now on that. As long as you did get a dismissal, and there were no other charges you got along with that one that ended up in a conviction, you can apply to get a Class C case expunged as soon as the case is dismissed and at least 180 days has passed since the offense date (normally the date you received the citation). Good luck.
If it was dismissed in 2013, you are eligible to have it expunged already. Without making it overly complicated, a safe rule of thumb for a Class C dismissal is 180 days from the date of dismissal. It's possible for it to be sooner than that, but the formula can be a little confusing. Either way, you are well past the 180 day waiting period.
The short answer is 6 months after December 2013. AS LONG AS you haven't committed more crimes or have prior bad criminal history. (there are always some special circumstances).
I am a Dallas area criminal defense attorney and former State prosecutor. The above answer, and any follow up comments or emails, is for informational purposes only and not meant as legal advice. This answer does not form an attorney-client relationship.
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