An alleged top Sinaloa Cartel fentanyl producer accused of supplying millions of deadly pills to the Chapitos was charged in a newly unsealed US indictment after Mexican authorities arrested Ivan Valerio Sainz Salazar in Sinaloa, federal prosecutors said. The Department of Justice (DOJ) said Thursday that Sainz Salazar, also known as “Mantecas,” is charged with fentanyl trafficking and weapons offenses tied to an alleged conspiracy to manufacture the drug for the Sinaloa Cartel and smuggle it