The House of the Scorpion, by Nancy Farmer, 2002

Matteo Alacran foot bears a tattoo: Property of the Alacran Estate. Matt is no mere slave; he's a clone, with no more legal rights than cattle. But unlike other clones whose minds are stunted at birth, Matt is ultimately raised as a pampered prince, led to believe he's the heir of El Patron, the drug lord whose clone he is and whose opium empire he thinks he'll inherit. Provocative science fiction with memorable characters that asks probing questions not only about science and ethics but international trade, law, economics, and drug trafficking. Recommended.