Paternity can be determined by highly accurate tests conducted on blood or tissue samples of the father, or alleged father, mother and child. These tests have an accuracy range of between 90 and 99 percent. They can exclude a man who is not the biological father and can also show the likelihood of paternity if he is not excluded. Each party in a contested paternity case must submit to genetic tests at the request of either party. If the father could be one of several men, each may be required to take a genetic test. It is almost always possible to determine who fathered a baby and to rule out anyone who did not. There are several different ways to establish whether an alleged father is the natural and legal father of the minor child.