This one is a little tricky. He is accused of engaging in sexual conduct with a high school student who is 17. In Texas, that wouldn't be a crime but for the fact he is a teacher and she is a student. And it doesn't matter that he doesn't even teach on her campus (he's a middle school teacher; she's a high school student.)
Edit: Wait a second! This is obviously a political prosecution by conservative, right wing local authorities who just got mad because they say this on his Facebook page . . .