Lex Fridman introduces Chris Tarbell as one of the most successful cybersecurity law enforcement agents of all time and asks him to tell the story of tracking down Ross Ulbricht and Silk Road. Chris explains that Silk Road was the first dark market website where people could buy anything except guns and fake degrees. He then talks about how he had to sell the case internally to the FBI by finding the worst thing on the website, such as postings for baby parts.