By Jason Buch, Julio-Cesar Chavez and Ted Hesson SAN ANTONIO (Reuters) -The suspected driver of a truck packed with dozens of migrants who died in blazing heat during a Texas smuggling attempt was allegedly under the influence of methamphetamine when police encountered him, a U.S. lawmaker told Reuters, citing information from law enforcement. San Antonio police officers found Homero Zamorano Jr, a Texas native, hiding in brush near the abandoned tractor-trailer on Monday, according to documents filed in federal court on Thursday. Fifty-three migrants lost their lives, making it the deadliest …