In this section, “missing child” means a minor whose whereabouts are unknown to a parent or other person who has permanent care and custody or responsibility for the supervision of the minor. Except as provided in subsection (c) of this section, a parent or other person who has permanent care or custody or responsibility for the supervision of a minor under the age of 13 years may not recklessly or willfully fail to notify the appropriate law enforcement agency that the minor is a missing child within 24 hours of the time at which the parent or other person knew or should have known that the minor is a missing child. This section does not apply if the fact that the minor is a missing child has already been reported to the appropriate law enforcement agency. A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 3 years.