FoodReg, TraceTracker and other colleagues have been interviewed recently by Mason Inman to understand food traceability better. Under the title “Fifty ways to interrogate your dinner” he has then published an article in the June 16th, 2009 edition of the New Scientist, an accomplished magazine for the dissemination of science. The New Scientist, being published in paper now for over 50 years, attracts about 2 million users each month for its electronic publication and another 800,000 for its printed edition.
Mason has done a pretty good job in summarising traceability and the determination of origin, so it is probably worthwhile to have a look at the original article.

You will find it here: http://www.newscientist.com/article/mg20227126.500