Not really. Someone has been hitting the University of Pittsburgh with bomb threats now for over a month... most via e-mail through an anonymous re-mailer site. The FBI has been all over it and they still haven't tracked the ass---- down.
There are a number of "explanations" for that: It's only a matter of time until they do, or for some reason "they" are "dragging their feet" in revealing the perps, or the "bad guys" are just one techno-step ahead of the "good guys." Regardless, that does not mean the technology is "not there" to nab them.