A presumed parent or alleged genetic parent may sign a denial of parentage in a record. The denial of parentage is valid only if:

(1) An acknowledgment of parentage by another individual is filed under RCW 26.26A.220;

(2) The signature of the presumed parent or alleged genetic parent is attested by a notarial officer or witnessed; and

(3) The presumed parent or alleged genetic parent has not previously:

(a) Completed a valid acknowledgment of parentage, unless the previous acknowledgment was rescinded under RCW 26.26A.235 or challenged successfully under RCW 26.26A.240; or

(b) Been adjudicated to be a parent of the child.