"This research systematically examines the major terrorism trials of our times. Those trials involve a number of terrorism cases both foreign and domestic in nature. In summarizing concisely both the varieties and the specific techniques of criminal activity within various terrorist organizations, the study shows that terrorist-oriented criminality does, indeed, have distinguishing features. International jihad groups are statistically more likely than domestic right-wing groups to commit aircraft and motor vehicle-related crimes; violations of explosive materials; and firearms violations. Right-wing domestic groups are more likely to commit mail fraud; racketeering; robbery/burglary; and violations involving machine guns and destructive devices. The main finding of the study is that the most successful method of both detecting and prosecuting cases of terrorism is through the pursuit of conventional criminal investigations. By analyzing past successful prosecutions and the evidence accumulated from studying them, the research strongly suggests that the best practices of investigators should be directed to crimes that facilitate the operation of complex organizations."
U.S. Department of Justice: http://www.doj.gov/