In south carolina is there a law that states that a person can't be charged for a crime that is drug related?

I recently heard someone speaking about a robbery that took place in my neighborhood. A young man was charged with robbery, because the "victim" stated she was robbed for personal property, when in actuallity she was robbed for drugs and drug related thiings, as told by a relative of the "would be" victim . I told the relative that she should go to the police because, I was told that you could not charge someone in a drug related event. Am I right, isn't this a law in sc? - Is this your question? Add additional information