High School double-bonus

[c_t_martin]

I'm coaching in a pre-junior high basketball league that follows NFHS basketball rules. I cannot find these rules online and I have a question about when a team is in the double-bonus. The High School kids refing the game, the league officials, and the other coaches all seem to have a different opinion on this.

How many fouls during the quarter (or half) before a team is in a one-and-one situation; and then, how many before a team is in the double bonus?

Any help, and links to official rules, would be greatly appreciated.