McALLEN — The drug conspiracy trial of a former Hidalgo County sheriff's deputy has persistently turned attention to his one-time boss, Sheriff Lupe Treviño, who in a dramatic turn took the stand Friday morning to respond to allegations of illegal campaign fundraising tactics and how much he knew of his deputies' illicit activities. Jorge Garza, a retired warrant officer accused of helping to steal drug loads from smugglers for resale, is the only former lawman to stand trial in a scandal that has brought down the sheriff's son and called into question the integrity of Treviño, who has cast himself...