According to the factual documents presented in court on 8 May 1998, the Matamoros-based criminal syndicate of the Gulf Cartel was responsible for trafficking tremendous amounts of narcotics into the United States from the mid-1970s to the mid-1990s, and García Ábrego was given eleven life sentences in prison. During the four-week trial, 84 witnesses, ranging from "law enforcement officers to convicted drug smugglers," confessed that García Ábrego smuggled loads of Colombian cocaine on planes and then stored them in several border cities along the Mexico–United States border before being smuggled to the Rio Grande Valley.