...just a note as I am a veteran educator. Teachers get fired for breaking the rules. Curriculum is concrete. Every child at every grade level gets basically the same lessons daily in a district and individual school.
...frustrated or sometimes teachers with a beef, will teach against policy just because they feel they have to do that or they make a wrong judgement and statement in a place where the move stands a "0" chance of going over. It's in the contract.
...the way to get the curriculum you want is simple. Buy more local property and have more tax dollars for your school. Form strong, savvy PTAs and raise money to pay special educators like me to come into your school with some culture and esoteric "traditional" African skills! Get elected to the local School board and have a vote on what goes down...if you're really ambitious (and qualified) run for School Superintendent....these are the things that the majority practices every day...they don't fail!