http://www.newsweek.com/id/174601/output/print

Not long afterward, Tamm says, he started getting phone calls at his office from Jason Lawless, the hard-charging FBI agent in charge of the case. The calls at first seemed routine. Lawless was simply calling everybody who had worked at OIPR to find out what they knew. But Tamm ducked the calls; he knew that the surest way to get in trouble in such situations was to lie to an FBI agent.

Yep, never ever talk to an FBI agent, they are trying to trap you.