"South Carolina is a destination and, to a far greater extent, a transshipment point for illicit drugs destined for the Southeast and other areas of the nation. Colombian, Mexican, Dominican, and African American criminal groups transport most of the drugs to South Carolina from sources in foreign countries and from U.S. distribution centers. Passenger vehicles, package delivery services, air packages or couriers, and commercial buses, trucks, and railways are the most common means used to transport drugs. Mexican, African American, Caucasian, and Dominican criminal groups, street gangs, outlaw motorcycle gangs, and independent dealers are involved in the distribution and retail sale of drugs. [...] The availability, distribution, and abuse of powdered and crack cocaine constitute the primary drug threats in South Carolina."
NDIC State Drug Threat Assessments: