NFHS Mercy Rule

[Luv4Asian8]

Had one last night. It has been a while since I had last enforced one so I was trying to look up the authority on it at half time just to make sure I remembered it correctly. To my surprise, I could not find it. I scanned the entire rulebook twice, and in particular Rules 2, 4 and 6. Partner was foggy as well.

To my recollection, if a team is up 40+ points in the 4th, the clock runs for the duration of the game, except for timeouts or "other" stoppages. This is what we used last night, without incident.

Then took another cold scan this morning and still could not find the citation. Can another set of eyes help me out? Just want to make sure it's right.

Thanks