Randy Turner was suspended not for his Huffington Post article but for his book. This is why teachers need tenure: Academic freedom.
He sent this comment:
“Thanks for the kind words from everyone. My suspension coming at almost exactly the same time as my Huffington Post blog was a coincidence. Basically, it happened because I wrote a novel, No Child Left Alive, criticizing many of the practices in education today, particularly those done by overambitious administrators. I just finished posting the charges against me on my blog: http://rturner229.blogspot.com/2013/04/the-joplin-school-districts-charges.html