Linda --
Just FYI about that saliva article: Rosie Mestel was a medical writer for the Los Angeles Times (she's now the deputy health/science editor), and that article was published in the LAT on Jan. 21, 2002.
So yes, there have been quite a few advancements in the intervening years!
(Brian: you might want to put a date on that article, plus give credit to the LAT.)