. >> reporter: vinnie martinez is chief deputy sheriff of brooks county last year he reported well over dead migrants. today numbers are on trend to exceed that. >> from year-to-date we're 92% increase from 2012. we had 129 in 2012. we see the influx. we see the volume high on pedestrians markers coming through the brush . >> reporter: an impoverished crumbling town near the mexican border. but the checkpoint just south of town is the last barrier for migrants to dallas and beyond. human smugglers have found ways to evade the checkpoint. migrants rush out of the smugglers' vehicles and hide in the bush. then he they are led on a long march through miles of rough country. anyone who can't keep up or gets hurt or sick is left behind. and most of those people simply never make it out of the forest alive. these photos are of corpses found on the sprawling ranches, exhaust, heat stroke and thirst can kill a person in hours. >> you find them deteriorated like it's a horror movie. you're missing skin, limbs, or eyeballs, you know, that's a sad situation. >> reporter: recently in an effort to i