Physicians and executives are among 18 people accused of selling prescription drugs over the Internet to people without any examinations, according to an indictment unsealed that charges them with federal racketeering. The 313-count indictment marks the first time organized-crime statutes designed to combat drug cartels and mafia rings have been used to charge anyone with selling prescription drugs over the Internet, said Lorraine Concha, an assistant special agent in charge for the Immigration and Customs Enforcement field office in San Diego.