Johannesburg, South Africa – In the quiet mining town of Swartruggens, a small courthouse is preparing to decide whether five Mexicans accused of a major illegal drug operation will be granted bail or remain in custody. Their arrests followed a raid on a remote farm in North West province, where police said they uncovered a large methamphetamine laboratory worth about one billion rand ($60m). The case is one of several pointing to a pattern taking shape in South Africa's rural interior.