CNN Murder in Mexico Falcon Lake January 5, 2014 02:02:00
>> reporter: they are also trying to stop the violence of a full-scale drug war from spilling north. >> are there parts of this border that you would be basically lawless or run by the cartels? >> absolutely. >> reporter: smack in the middle of this 21st century version of the wild west, two young americans, david hartley and tiffany young, just teenagers when they fell in love. >> we started dating in '98. the summer of '98, and dated for quite a while before we got engaged in 2001 and married in 2002. >> what took so long? >> we were 18. >> reporter: they wound up here, in the mexican border...