28 C.F.R. § 19.3
(b) Because the use of inserts printed with missing children photographs and biographical information has been determined to be the most cost effective method for general application of the program, DOJ's first priority will be to insert, manually and via automated inserting equipment, photographs and biographical data related to missing children in a variety of types of penalty mail envelopes. These include:
(c)
(g) DOJ will give priority to penalty mail that: