Special education budget

I'm unsure if this is the correct forum to post this question. I am certified in both Special Education as well as English 9-12 in the state of North Carolina. I am trying to move out of Special Education, and into strictly English. This year, I was asked to teach one period of English, and the remaining periods of Special Education classes. I was then told that I am unable to do this because my salary is paid by the Special Education budget, and cannot simultaneously teach a general education class. I am trying to find this information online, but I can't find anything that answers this question.