and brutal drug cartel that's risen to power here, strongly within the last year. this has been kind of the way they do business, sending a clear message. it reminded us of a story we had done about a year and a half ago here for your show about two young teenage men that were recruited by the zetas to be hitmen. one of the investigators in that case talked about what it is that the zeta cartel members had employed and the brutal nature of the things that they do when they go after the people they killed, including something called "giso." >> it's slime, the way they did -- the way they dispose of bodies. they put them in 55-gallon drums, fill them with diesel. any type of combustible liquid and put tires around them and set them on fire. >> okay.