[BwanaNdege]

Was the implication that 30% of kids are fathered by someone other than the assumed father?

Skewed data source.

My bet is that only men with reasons to be suspicious have the child tested.

[PapaBear3625]

Was the implication that 30% of kids are fathered by someone other than the assumed father? Skewed data source.

Yes, those numbers came from testing done where the "official" father suspected something.

For cases not involving father suspicion, it varies, depending on country, race, and socio-economic status.

One study, "Measuring paternal discrepancy and its public health consequences", looked at various other studies. For non-disputed paternity (ie, the testing was not done because the father suspected anything), USA results were

Michigan white sample: 1.4%

Michigan black sample: 10.1%

California white sample: 2.7%

Hawaiian families: 2.3%