The source of the 30% statistic is from a selection-biased sample of people who undergo paternity testing because there is already a question as to who is the f

The source of the 30% statistic is from a selection-biased sample of people who undergo paternity testing because there is already a question as to who is the father. It's not an accurate figure. The actual rate is likely somewhere between 1-3%. More detail here: http://www.straightdope.com/columns/read/2730/whos-your-daddy http://www.straightdope.com/columns/read/2730/whos-your-dadd...