they're ruthless and violent, but they're not stupid. >> captain stacy holland of the texas department of public safety says his proof is in these videos, captured night after night by the thermal imaging camera mounted underneath his helicopter. over the last few years there has been more violence and, most disturbing of all to holland, more coordination, lookouts, even reconnaissance in smuggling. >> one thing you have to understand is how well coordinated this is and what the level of scouting and planning and organization is. >> right curve in the road coming up. >> these videos of chases at first made to sense. >> you get a shot of this? >> yeah. i got it. >> drug runners caught in the u.s. and then racing back to mexico. >> southbound coming up to the river. >> their stolen vehicles being hurled full speed into the rio grande. >> oh, my god. right there.