High School Sub Change Both teams on throw-in?

[galenm]

I agree; I am not certain what the college ruling is, but in a league I once directed [non-competitive, for a city recreation service] the best rule we found over the years was to allow the "non-throwing team" to sub if, and only if, the throwing team substituted; this allowed the possessing team to maintain momentum if they chose, but once the game was "interrupted" for subs, we let them all on