Based on what you have written, it ultimately depends upon the specifics of the facts within your son's case. Generally, the more times an individual is charged with a certain crime the more punishement can be accessed based on an enhancement. If it is still being charged as a Class C Misdemeanor, then the max fine is $500.00 but the judge may order other items to be completed. You may want to consider consulting with a local law firm to ensure that you are fully protecting your son's rights and interests.
The above response given is not intended to create, nor does it create an on-going duty to respond to questions. Additionally, the response does not form an attorney-client relationship, nor is it intended to be anything other than an educated opinion. It should not be relied upon as legal advice. The response given is based upon the limited facts provided by the person asking the question. To the extent additional or different facts exist, the response might possibly change.