That is an excellent question. It's the topic of a conversation I've been having with the NFHS for a while.
For reasons I cannot explain, the NFHS (aka "the Fed") does not make them available. It's hard for officials' associations to get all we need. And forget about finding them online. They used to have a pdf form on the Fed website, but that's no more.
I find this ridiculous. We bang on fans and announcers who have no idea what our rules are because they see college rules on TV and think we play the same. We lose patience with pee wee coaches who have no ideas what the rules are and also coach to NCAA or NFL rules,
But the FED makes no effort to put the actual rules out there where they can be read and learned by people who would do well to know them.
The VHSL handbook is online, but it has very little regarding playing rules in there.
Let me see what I can find about a way to get you a copy.