State officials say there's no asbestos in the soon-to-be-demolished Casey Overpass. But that didn't stop some residents from prophesying doom. One man, convinced that crystalline silica won't be contained by methods outlined by the project team, thundered, "How dare you come in to Jamaica Plain and try to poison our children!" The beams of the aging flyover, whose paint may contain lead, will be cut down in pieces and trucked away, said Engineer Chris Evasius at a Monday informational meeting with the public at English High School. As for removal of the concrete, there won't be any blasting, he said.