Among the $500,000 homes and turquoise pools in one of the fancier precincts of Irvine, Calif., the gumshoes in white moon suits and gas masks looked weirdly out of place. But there they were last Friday digging up the yard of a churchgoing suburban gynecologist who had just committed suicide. And there they were removing--gingerly--six tall plastic canisters full of military-type weaponry, high-grade C-4 explosives with blasting caps, and possibly biomedical-research products.
Relatives of the gynecologist, Dr. Larry Ford, who was a partner in a small biotech firm, had told police of the weapons cache, and police feared the canisters might...