http://www.pbs.org/wgbh/pages/frontline/shows/jefferson/true/primer.html

Nonspecific DNA Results Link "Some" Jefferson.
Dr. Foster found that there was a match between the male descendants of Uncle Field Jefferson and those of Sally Heming's youngest son, Eston Hemings. However there was no match between the male descendants of Tom Woodson, Sally Hemings' first-born son. The nephews' heirs also did not match any of the others, and neither did the neighbors' descendants. Dr. Foster concluded that "the simplest and most probable explanation for our molecular findings are that Thomas Jefferson, rather than one of the Carr brothers, was the father of Eston Hemings Jefferson, and that Thomas Woodson was not Thomas Jefferson's son."
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Whoever undertakes to set himself up as a judge of
Truth and Knowledge is shipwrecked by the laughter
of the gods.

-- Albert Einstein