What kind of evidence is required to establish paternity?

In Washington, evidence is required to legally establish paternity (a legal father-child relationship) for purposes such as child support and medical insurance. Generally, this evidence can take a few different forms. The most common type of evidence used in Washington is a DNA test, which can be taken using a blood sample or saliva sample. This type of test is considered to be the most accurate method to determine paternity and typically used in legal proceedings. Another type of evidence that can be used is a voluntary declaration of paternity. This is a document signed by both the mother and the alleged father that affirms that he is the legal father of a child. This document must be signed in the presence of a notary public or court official and must be filed with the Washington State Department of Health. Finally, the court may also look to circumstantial evidence such as the testimony of friends or family members, how the father behaved in regards to the child, and the closeness of the relationship between the father and the child. In Washington, the evidence presented must meet a certain level of certainty to prove paternity. In general, the court will consider all of the evidence presented in determining paternity. However, it is important to note that the DNA test remains the most accurate and legally binding way to establish paternity.

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