The laboratory that is storing a blood sample shall provide access to the blood sample only to (1) a person who has been adopted pursuant to this part, (2) the adoptive parent of a person under the age of 18 years, (3) the birth parents. No person other than the adoptive parent and the adopted child shall have access to the blood sample or any DNA test results related to the blood sample, unless the adoptive parent or the child authorizes another person or entity to have that access.