A Mexican man living in the US donned outrageous disguises to disrupt deportation missions near the southern border , newly released court documents show.   Jaime Ernesto Alvarez-Gonzalez, 53, pled guilty in San Diego federal court Tuesday to one count of impersonating a federal agent and three counts of illegally possessing firearms. He overstayed his tourist visa decades ago, according to prosecutors.  Alvarez-Gonzalez at a shooting range. United States Department of Justice He was carrying this FBI badge when he was finally arrested. United States Department of Justice In one Jan. 8 caper, Alvarez-Gonzalez closely followed an actual Border Patrol agent while both were driving black, Ford F-150 trucks. Alvarez-Gonzalez’s truck appeared to be undercover Border Patrol, with a Border Patrol windshield sticker, fake radio antennae, a lightbar, a license plate frame marked “FERDERAL TRUCK,” and handcuffs dangling from the rearview, prosecutors said.…