Personally I do not see that being legal. State laws rule over all county laws just like federal laws over rule all state laws. I would be willing to bet if you have a dispencary within a 1,000 foot of a school the state will step in and arrest you and pad lock your doors.

The only way a city or county can have something different is if when a law is written the state allows for a city or county to be able to vote or allow this or that.

Kind of like in the law where the state makes mention to the fact a city or county can decide is they want store fronts to be able to sell marijuana

The state is very clear cut on the 1,000 foot rule when it comes to schools. I also think there are certain law enforcement officer that are bitting at the bit to close down dispencaries.