I think you must stop for them in any state. The only way you do not have to stop is if there is a divided median betwen youWhere I live you MUST stop for school buses. Doesn't matter if you are behind them, or facing them in oncoming traffic.
Yes it is a royal pain in the butt to get 'stuck' behind one, and I have been late to appointments because of this. However in the BIG Picture, Better safe than Sorry.