2005 Washington Revised Code RCW 26.26.310: Denial of paternity.

A presumed father of a child may sign a denial of his paternity. The denial is valid only if:

     (1) An acknowledgment of paternity signed by another man is filed under RCW 26.26.320;

     (2) The denial is in a record, and signed under penalty of perjury; and

     (3) The presumed father has not previously:

     (a) Acknowledged his paternity, unless the previous acknowledgment has been rescinded under RCW 26.26.330 or successfully challenged under RCW 26.26.335; or

     (b) Been adjudicated to be the father of the child.

[2002 c 302 § 303.]