where more than 1,300 people died from overdoses last year, the most in state history. 31-year-old sarah witner was one of them. heher father and sister speakin out. >> i was cpo on my daughter, trying to bring her back, knowing it wouldn't work, but i had to try. something i wouldn't wish on anyone because that won't go away. >> reporter: even with multiple agents working together and advanced technology, they're often outnumbered. >> they use these opportunities when our agents are occupied, apprehending these people who are coming over. and that's when they're moving their drugs at the same time. >> reporter: an escalating war with casualties far beyond the border. janet shamlian, el paso. >>> a tiny village in south africa is the epicenter of a diamond rush. deborah pava has the story. >> reporter: it started with a chance discovery and turned into a mass treasure hunt. once word got out a local herdsman dug up what might be a precious stone, thousands of fortune seekers flocked to t th small rural village. >> heard that people are digging diamonds there, so i said, no, let me come and take