Narcotics officers stumbled upon a record number of illegal immigrants Friday evening while searching the Madera County home of a man arrested in a drug sting, police said.Fresno police say they found 80 undocumented Mexican immigrants at the home of 38-year-old Jose Esparza, an accused methamphetamine dealer who allegedly sold an undercover officer a half-pound of drugs Friday afternoon.The discovery marked what appears to be the largest immigrant smuggling ring uncovered by the Fresno Police Department, said Sgt. Alex Flores, supervisor of the major narcotics unit..Flores says federal agents needed two large buses to take the immigrants to Fresno, where...