NFHS Bat Rules

[Dakota]

If no stamp, or not on the approved list, the bat is not allowed in an NFHS game.

The reason is NFHS adopted the ASA bat performance standard (which results in a bat being on the approved list / stamped), but did not adopt the ASA bat rule, which includes the umpire judgment paragraph.

There is no umpire judgment on approved bats in an NFHS game. They are either explicitly approved, or they are not allowed in the game.