I don't know, nocarename; if it was the McGill Feighan books, wouldn't Bob have remembered and narrowed the possibilities down by mentioning the whole "Chosen by An Alien Emissary" business from Feighan's infancy? As I recall, obsession with that incident often seemed to be close to constant among the characters. Granted, the description of the protagonist's line of work sounds pretty much spot on....
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"The Lady of the Lake, her arm clad in the purest shimmering samite, held aloft Excalibur from the bosom of the water, signifying by divine providence that this was some killer weed."
"The Lady of the Lake, her arm clad in the purest shimmering samite, held aloft Excalibur from the bosom of the water, signifying by divine providence that this was some killer weed."