Alleged cartel leader in jailCrime: 'Lord of Trailers' sought by authorities in the U.S. on old warrants.BY ANGELES NEGRETE LARESTHE BROWNSVILLE HERALDHugo BaldomeroMedina Garza, alleged head of the Gulf cartel who was arrested earlier this week in Mexico, also has a warrant for his arrest from the United States, as well as a long criminal record in the Rio Grande Valley, U.S. law enforce-ment officials said.U.S. Customs Service spokesman Rick Pauza said negotiations are con tinuing on the extradition of the alleged trafficker to the United States to face charges against him here.U.S. District Judge John William Black signed a warrant for his arrest in Brownsville in 1997, charging him with posses sion and conspiracy to dis tribute 2,200 pounds of marijuana.According to Carlos Becerrin, spokesman for Mexico’s SpecialProsecution Team of the Attorney General’s office, Medina Garza, 38, was arrested Wednesday at Ciudad Victoria, Mexico, on money laundering and drug smuggling charges.Mexican authorities said Medina Garza, dubbed “Lord of the Trailers, joined the Gulf cartel in 1990 and assumed control after Juan Garcia Abrego’s■ PLEASE SEt DRUGS, A14