Under some circumstances use of the low preponderance of evidence standard may be a violation of constitutional rights. For example, if a state seeks to deprive natural parents of custody of their children, requiring only proof by a preponderance of evidence is a violation of the parents’ DUE PROCESS rights (Santosky v. Kramer, 455 U.S. 745, 102 S. Ct. 1388, 71 L. Ed. 2d 599 ). Freedom in matters of family life is a fundamental liberty interest, and the government cannot take it away with only a modest evidentiary standard. However, a court may use a preponderance of evidence standard when a mother seeks to establish that a certain man is the father of her child (Rivera v. Minnich, 483 U.S. 574, 107 S. Ct. 3001, 97 L. Ed. 2d 473 ). Most states use the preponderance of evidence standard in these cases because they have an interest in ensuring that fathers support their children.