DNA paternity testing, whether prenatal or postnatal, will exclude the non-biological father with very high accuracy. However, only the results of a postnatal paternity test (if performed to legal requirements) will stand up in court. Prenatal paternity testing results cannot be used in a court of law. Most courts will not suggest using prenatal testing to determine paternity and almost always wait until after the baby is born to verify paternity. One of the main reasons for this is to avoid encouraging the use of invasive procedures such as CVS that can put the unborn baby at risk.