Va. Code § 22.1-261
The attendance officer or the division superintendent or his designee shall check the reports submitted pursuant to subsection A of § 22.1-260 with reports from the State Registrar of Vital Records and Health Statistics. From these reports and from any other reliable source the attendance officer or the division superintendent or his designee shall, within five days after receiving all reports submitted pursuant to subsection A of § 22.1-260, make a list of the names of children who are not enrolled in any school and who are not exempt from school attendance. It shall be the duty of the attendance officer, on behalf of the local school board, to investigate all cases of nonenrollment and, when no valid reason is found therefor, to notify the parent, guardian or other person having control of the child to require the attendance of such child at the school within three days from the date of such notice.
Va. Code § 22.1-261