Eric Olson now has a new verb for what happened to his father, Frank Olson, who worked for the Army's top-secret Special Operations Division at Fort Detrick, where he developed bioweapons and experimented with mind-control drugs. Eric Olson found the verb in a 1950s CIA manual. The verb is dropped." And the manual is a how-to guide for assassins. "The most efficient accident, in simple assassination, is a fall of 75 feet or more onto a hard surface," the manual says, adding helpfully: "It will usually be necessary to stun or drug the subject before dropping him." Eric Olson believes his father -- who developed misgivings about his work and tried to resign -- was murdered by government agents to protect dark government secrets. "No assassination instructions should ever be written or recorded," says the CIA assassination manual. "Decision and instructions should be confined to an absolute minimum of persons." It adds: "For secret assassination the contrived accident is the most effective technique. When successfully executed, it causes little excitement and is only casually investigated." William P. Walter, 78, who supervised anthrax production at Detrick, says Olson's colleagues were divided about his death. "Some say he jumped. Some say he had help," Walter says. "I'm one of the 'had-help' people." So is James Starrs, a George Washington University forensic pathologist who ... called the evidence "rankly and starkly suggestive of homicide." In a report to the CIA on the death, [Harold] Abramson, [a doctor who had experimented with LSD] wrote that the LSD experiment was designed "especially to trap (Olson)." This ... raised a troubling possibility: that the LSD experiment was actually designed to see whether Olson could still be trusted to keep the agency's dark secrets.