OLV requires that the custodial parent file the most recent court-certified copy of the custody section of the divorce decree or a court-certified copy of the custody decree with the school. If no such copy is on file, school officials will presume that both parents have custodial rights. School officials will make all reasonable efforts to ensure that children are released only to the appropriate parent at the appropriate time according to the court-mandated custody arrangements. However, parents must accept the primary responsibility for such arrangements and should instruct their children as to which parent should have physical custody of them on any given day.