How to track a fugitive

Pennsylvania authorities tell CNN they've narrowed the search area for alleged cop-killer Eric Matthew Frein. The 31-year-old survivalist is wanted for the death of Pennsylvania State Police Cpl. Bryon Dickson and the shooting of another officer a week and a half ago. But the hundreds of law enforcement officers who are scouring the woods have yet to locate a man police say has extensive training as a marksman and knows his way around the woods. So, how do you track down a killer? CNN's Gary Tuchman gets a lesson in tracking fugitives from Patrick Patten, former head tracker of Eric Rudolph and Founder of the Tactical Woodland Operations School.

Search for alleged PA cop killer continues. How do you find a fugitive in rough terrain? @GaryTuchmanCNN 8p @CNN pic.twitter.com/vRNEq8c4sN

— Anderson Cooper 360° (@AC360) September 22, 2014