Red herring. The point is that science teachers are prohibited from uttering anything that might critcize evolution. That's the "extreme" position those on the board are having to contend with, Popular Science spin notwithstanding.
Can you substantiate this point? Are they forbidden to discuss scientific questions within evolution, or are they forbidden to discuss religious alternatives, such as CS and ID which are not science, but beliefs?
Definitions:
Theory: a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory"
Belief: any cognitive content (perception) held as true
Based on this, evolution is a theory. CS and ID are beliefs.
What do you mean by criticise? And what controversy is there within the community of biologists that could be understood by high school students?