“In child support cases, the burden of proof is on the alleged father — the accused — according to Oklahoma statutes.
An alleged father must appear at a child support hearing to request a paternity test. If he does not appear, he is legally designated as the father and child support is established in most cases.”
An example of the screwy nature of this thing ... but at the state, not at the federal level.
As far as I know child support is the only area where DNA testing doesn’t matter. If you’re in jail for murder and DNA exonerates you, you go free; if you have a support order and DNA proves you aren’t the kid’s parent, tough.