http://www.nytimes.com/2015/12/27/business/dealbook/the-unsung-tax-agent-who-put-a-face-on-the-silk-road.html
When Mr. Alford took his findings to his supervisors and failed to generate any interest, he initially assumed that other agents had already found Mr. Ulbricht and ruled him out.
When Mr. Alford visited the main F.B.I. team on the case, later in the summer, it became clear that the team wasn’t aware of Mr. Ulbricht as a suspect — and also had no serious candidates of their own. Mr. Alford mentioned that he had a suspect in San Francisco, but no one followed up.
One of the other agents present for that meeting, who spoke on the condition of anonymity, said that he and the others in the room had little reason to ask for further information from Mr. Alford, given the lack of progress made by the D.E.A. Strike Force to which he was assigned. “No one was taking them seriously,” the agent said. “I obviously wished we had asked more.”