[George W. Bush]

The study’s finding of 25% struck me as absurdly high but this was a UK study and had to be limited. There was no indication that it applied to the whole population.

There was a famous medical study done on this in America, back in the Sixties. I can't recall what they were studying. But it came to light unintentionally that over 20% of the children weren't fathered by their mother's husband.

[romanesq]

That 20% number sounds high considering the information was most likely not definitive. DNA sure does add a wrinkle. Or gnashing of teeth.

[romanesq]

This article references many studies. Apparently some of them ranged as high as 30% error in paternity, but in their broader assessments it appears the “normal” range is much lower in the 3-4% range.

http://www.canadiancrc.com/articles/BBC_Paternity_Fraud_Study_UK_John_Moores_University_10AUG05.htm

[HitmanLV]

But it came to light unintentionally that over 20% of the children weren't fathered by their mother's husband.

I have heard the figure of 10% a lot, but 20% is perfectly credible to me.