I've read allegations that David Kelly's rapid turn around from saying that there were WMDs present to arguing that there were none present was the result of blackmail over evidence of him being sexually involved with an aide.<p>Googling on "David Kelly blackmail" gives thousands of hits.<p>Here's one:<p><a href="http://www.dailymail.co.uk/news/article-490216/Sex-drugs-blackmail-plot-royal-Im-innocent.html" rel="nofollow">http://www.dailymail.co.uk/news/article-490216/Sex-drugs-bla...</a>