sentences:  Mexico is a major source of drugs entering the United States.By the 1990s, 80%–90% of the cocaine smuggled into the United States arrived through Mexico.In February 1985, US Drug Enforcement Administration agent Enrique Camarena, nicknamed "Kiki", was kidnapped in Mexico, tortured and then murdered, in what was seen as an attempt by the Mexican drug cartels to intimidate the United States.