Jumping Frog
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From http://news.yahoo.com/s/ap/20090613/ap_on_go_ot/us_lone_wolf_terrorists
When investigating a terrorist network, FBI agents can often access e-mails, phone records and documents to build a case. In some cases, they can develop informants to penetrate the group and provide intelligence.
But a killer acting alone rarely tells anyone what he's planning, let alone when or how. That makes it hard for authorities to determine who is prepared to commit a criminal act in furtherance of a perceived cause.
Trying to counter that threat, the FBI has created what it calls "tripwires." These are programs that seek tips from businesses whenever someone buys significant amounts of materials that can be used to make explosives, or large amounts of weapons or ammunition.
Such precautions seem to have worked in the case of a man who cleaned out his savings account in Utah and told the bank teller he was on a mission to kill President Barack Obama. The man, who relatives said suffers from mental illness, triggered a criminal investigation and he was eventually arrested.
In Washington, the white supremacist Von Brunn apparently skirted such tripwires by using a vintage rifle from the early 20th century. With that single, small-caliber gun, a museum security guard was killed before other guards opened fire and disabled von Brunn.