. >> in 2013, the fbi seized the dark web and arrested its kerry ross albrecht. hoping to deter online users officials from 17 countries helped arrest 17 people. they seized several dark net parks that had gained popularity after silk road's road's downturn. dan palumbo a dark net researchers at designate alliance maintains this scrunltd isthe scrutinyis necessary. >> they do come back, after taking an initial hit. you'll see successes and these giet are very resilient with websites different iterations. >> fast-forward to a surprising twist in the take down of silk road. two agents are now accused of profiting themselves. one allegedly diverted more than $800,000 of bitcoin into his own account. >>> law enforcement in another community crisis. >> we have standing orders to do so our policy is, we are authorized to go ahead and administer it. seconds count we got to get it as soon as we can. >> america's heroin epidemic and the anecdote. lori jane gliha and the device many emergency medical personnel are carrying. >>> the words her mighty voice speaks to us acros