It is intriguing that the presence of tiny amounts of horse DNA in beef burgers and the presence of 29% of horse in one beef burger continues to be covered by media as one story. It may be a profoundly depressing suggestion but it is possible that the reason for the conflation is an alarmingly poor grasp of basic mathematics.
Industry explanations for the presence of horse DNA go something like this: “We use pure Irish beef but we add some filler which we buy in from the continent and it is possible that this may have somehow been contaminated by horsemeat.”
Clearly if this explanation is applied to the 29% finding, it is complete bollocks. 29% is pushing on for one third horsemeat.
Let’s slap the beef down in front of us. It’s 100% Irish beef but in order to make it stick together and/or to reduce cost, we increase its volume by adding 50% imported filler. It is now roughly 60% Irish beef and 30% imported filler.
Assuming that the truth has been told about the Irish beef content, there is only one way that there could be 29% horsemeat in the burgers: the filler must have been almost 100% horsemeat! Pure horsemeat, not traces of horse DNA!
Yes, the figures above were made up but they are not fantastic. The point is that the story about traces of horse DNA is not the same story as the 29% horsemeat content. That it is treated as such feeds a fear either that journalists can’t grasp the numbers or that they can but they believe that citizens cannot.
I’ve mentioned poor basic maths before: