You only need to go to page 64 of the 2007 ASA rule book.
Quote:
3.1.A CERTIFIED/APPROVED. The official bat for ASA Championship Play must meet all the ASA specifications and the requirements of Rule 3, Section 1, and:
1. must bear either the ASA 2000 certificiation mark or the ASA 2004 certificiation mark as shown below, and must not be listed on an ASA Non-Approved Bat List.
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This rule alone demonstrates that bats with the ASA certification mark and are not on the Non-approved list meet the 2004 certification standards. And since the bats do meet the 2004 standards, they should be legal for NFHS play without going to the approved list.