It is always going to stay on your record forever. It is not something that would just drop off after a period of time. If you are a first time offender and the case is still open, you can inquire about entering into a pre-trial diversion program to get the case dismissed.
Pursuant to South Carolina Code of Laws § 44-53-450(b), any person who has been sentenced to a "Conditional Discharge" for their first offense of simple possession of marijuana, may, upon completion of the sentencing requirements, apply to the court for an order to expunge from all official records all information relating to his arrest, indictment, trial, finding of guilty, and dismissal and discharge pursuant to this section. No person as to whom such order has been entered shall be held thereafter under any provision of any law to be guilty of perjury or otherwise giving a false statement by reason of his failures to recite or acknowledge such arrest, or indictment or information, or trial in response to any inquiry made of him for any purpose
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